Range [Axis] Minimum [Member] Maximum [Member] Equity Components [Axis] Common Stock [Member] Treasury Stock [Member] Paid In Capital [Member] Retained Earnings [Member] Accumulated Other Comprehensive Income (Loss) [Member] Noncontrolling Interest [Member] Type of Arrangement and Non-arrangement Transactions [Axis] Loan Agreement [Member] Loss Contingency Nature [Axis] Insurance Claims [Member] Award Type [Axis] Phantom Stock Plan [Member] Consolidated Entities [Axis] Foreign Subsidiary's [Member] Product and Service [Axis] Shipping Costs [Member] Property, Plant and Equipment, Type [Axis] Land [Member] Buildings [Member] Leasehold Improvements [Member] Equipment [Member] Restricted Stock Unit Awards [Member] Geographical [Axis] Houston [Member] Middletown [Member] Retirement Plan Type [Axis] Qualified Non-contributory Profit-sharing [Member] Retirement Plan Tax Status [Axis] Qualified Savings and Retirement [Member] Banbury [Member] Variable Rate [Axis] LIBOR plus [Member] LIBOR plus One [Member] Prime Rate Plus [Member] Customer [Axis] Customer One [Member] Concentration Risk Type [Axis] Customer Concentration Risk [Member] Concentration Risk Benchmark [Axis] Sales Revenue Net [Member] Accounts Receivable [Member] Geographic Concentration Risk [Member] North America [Member] Scenario [Axis] Since Inception [Member] Title of Individual [Axis] Non-Employee Directors [Member] Subsequent Event Type [Axis] Subsequent Event [Member] Document And Entity Information Entity Registrant Name Entity Central Index Key Document Type Document Period End Date Amendment Flag Current Fiscal Year End Date Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Interactive Data Current Entity Filer Category Entity Small Business Flag Entity Emerging Growth Company Entity Shell Company Entity Public Float Entity Common Stock, Shares Outstanding Document Fiscal Period Focus Document Fiscal Year Focus Statement of Financial Position [Abstract] ASSETS Current Assets: Cash and Cash Equivalents Accounts Receivable - less allowances of $1,433 and $985, respectively Investments Inventories - Net Other Current Assets Total Current Assets Right-Of-Use Assets - Operating Property and Equipment - Net Goodwill - Net Deferred Taxes Other Long Term Assets Total Assets LIABILITIES AND SHAREHOLDERS' EQUITY Current Liabilities: Accounts Payable Accrued Compensation Accrued Commissions and Sales Incentives Dividends Payable Taxes Payable Lease Liability - Operating Other Liabilities Total Current Liabilities Lease Liability - Operating, net of current portion Deferred Taxes Other Long Term Liabilities Total Liabilities Commitments and Contingencies (Note 10) Shareholders' Equity: Omega Flex, Inc. Shareholders' Equity: Common Stock - par value $0.01 share: authorized 20,000,000 shares: 10,153,633 shares issued at December 31, 2019 and 2018, respectively, and 10,094,322 and 10,091,822 outstanding at December 31, 2019 and 2018, respectively Treasury Stock Paid-in Capital Retained Earnings Accumulated Other Comprehensive Loss Total Omega Flex, Inc. Shareholders' Equity Noncontrolling Interest Total Shareholders' Equity Total Liabilities and Shareholders' Equity Allowance for doubtful accounts receivable Common stock, par value Common stock, shares authorized Common stock, shares issued Common stock, shares outstanding Income Statement [Abstract] Net Sales Cost of Goods Sold Gross Profit Selling Expense General and Administrative Expense Engineering Expense Operating Profit Interest Income Other Income (Expense) Income Before Income Taxes Income Tax Expense Net Income Less: Net Income - Noncontrolling Interest Net Income attributable to Omega Flex, Inc. Basic and Diluted Earnings per Common Share Cash Dividends Declared per Common Share Basic and Diluted Weighted Average Shares Outstanding Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Net Income Other Comprehensive Income (Loss): Foreign Currency Translation Adjustment Other Comprehensive Income (Loss) Comprehensive Income Less: Comprehensive Income Attributable to the Noncontrolling Interest Total Other Comprehensive Income Statement [Table] Statement [Line Items] Balance Balance, shares Cumulative Translation Adjustment Shares Reissued From Treasury Pursuant To Restricted Stock Unit Awards Shares Reissued From Treasury Pursuant To Restricted Stock Unit Awards, shares Dividends Declared Balance Balance, shares Statement of Cash Flows [Abstract] Cash Flows from Operating Activities: Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities: Non-Cash Compensation Expense Depreciation and Amortization Provision for Losses on Accounts Receivable, net of write-offs and recoveries Deferred Taxes Provision for Inventory Reserves Changes in Assets and Liabilities: Accounts Receivable Inventories Other Assets Accounts Payable Accrued Compensation Accrued Commissions and Sales Incentives Lease Liability, Net Other Liabilities Net Cash Provided by Operating Activities Cash Flows from Investing Activities: Purchase of Investments Net Proceeds from Sale of Investments Capital Expenditures Net Cash Provided by (Used In) Investing Activities Cash Flows from Financing Activities: Dividends Paid Net Cash Used In Financing Activities Net (Decrease) Increase in Cash and Cash Equivalents Translation effect on cash Cash and Cash Equivalents - Beginning of Year Cash and Cash Equivalents - End of Year Supplemental Disclosure of Cash Flow Information Cash paid for Income Taxes Declared Dividend Accounting Policies [Abstract] Basis of Presentation and Consolidation Significant Accounting Policies Inventory Disclosure [Abstract] Inventories Property, Plant and Equipment [Abstract] Property and Equipment Debt Disclosure [Abstract] Line of Credit Equity [Abstract] Shareholders' Equity Income Tax Disclosure [Abstract] Income Taxes Leases [Abstract] Leases Retirement Benefits [Abstract] Employee Benefit Plans Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Share-based Payment Arrangement [Abstract] Stock - Based Compensation Plans Related Party Transactions [Abstract] Related Party Transactions Subsequent Events [Abstract] Subsequent Events Quarterly Financial Information Disclosure [Abstract] Quarterly Consolidated Financial Statements (Unaudited) Use of Estimates Revenue Recognition Cash Equivalents Accounts Receivable and Provision for Doubtful Accounts Investments Inventories Property and Equipment Goodwill Stock-Based Compensation Plans Product Liability Reserves Leases Fair Value of Financial and Nonfinancial Instruments Advertising Expense Research and Development Expense Shipping Costs Earnings Per Common Share Currency Translation Income Taxes Other Comprehensive Income Significant Concentrations Subsequent Events Recent Accounting Pronouncements Schedule of Inventories, Net of Reserves Schedule of Property and Equipment Schedule of Regular Quarter Dividend Payments Schedule of Components of Income Tax Expense (Benefit) Schedule of Effective Income Tax Rate Reconciliation Schedule of Deferred Tax Assets and Liabilities Schedule of Future Minimum Rental Payments for Operating Leases Summary of Nonvested Phantom Stock Units Schedule of Quarterly Financial Information Statistical Measurement [Axis] Defense costs per claim Operating lease assets Operating lease liabilities Advertising expense Research and development expense Shipping costs Income tax rate examination description Corporate tax rate percentage Concentration risk percentage Concentration risk percentage description Inventory valuation reserves Finished Goods Raw Materials Inventories - Net Construction in progress, gross Depreciation and amortization expense Property and Equipment - Gross Accumulated depreciation Property and Equipment - Net Property and Equipment, Useful Lives Collaborative Arrangement and Arrangement Other than Collaborative [Axis] Line of credit facility, description Line of credit facility, maximum borrowing capacity Line of credit facility, expiration date Line of credit interest rate percentage Line of credit facility, interest rate description Line of credit facility, commitment fee description Line of credit period Line of credit facility, outstanding Treasury stock, common, shares Dividend paid Payments of noncontrolling interest Share based payment award, granted Compensation cost Stock repurchase program, authorized amount Stock repurchased during period, shares Stock repurchased during period, value Stock repurchased during period, value per share Dividend Declared, Date Dividend Declared, Price Per Share Dividend Paid on or Before Date Dividend Paid on or Before Date, Amount Foreign income included in pre-tax income Federal income tax percentage Income tax examination description Taxes on unremitted foreign earnings Unrecognized tax benefits Federal Income Tax, Current Federal Income Tax, Deferred State Income Tax, Current State Income Tax, Deferred Foreign Income Tax, Current Foreign Income Tax, Deferred Computed Statutory Income Tax Expense State Income Tax, Net of Federal Tax Benefit Foreign Tax Rate Differential Impact of Deemed Repatriation Related to the 2017 U.S. Tax Law Changes Manufacturing Deduction Impact of Federal Tax Rate Reduction on Deferred Taxes Executive Compensation Limitation Foreign Derived Intangible Income Deduction Research Credit Increase/(Reduction) in Tax Uncertainties Valuation Allowance for Foreign Loss Carryover Other - Net Income Tax Expense Compensation Assets Inventory Valuation Accounts Receivable Valuation Deferred Litigation Costs Foreign Net Operating Losses Valuation Allowance for Loss Carryover Other Compensation Liabilities Total Deferred Assets Prepaid Expenses Depreciation and Amortization Total Deferred Liabilities Total Deferred Tax Liability Operating leases term, description Right-of-use assets Lease liability Lease liability, current Weighted average remaining lease term Discount rate Operating lease expense 2020 2021 2022 2023 2024 Thereafter Total Lease Payments Contributions accrued for the plan Employee contribution percentage Employer contribution percentage Contribution percentage on gross wages Employee contributions, description Payment benefit to employee's Employee benefit payment term description Other compensation liabilities Other compensation liabilities, noncurrent Other compensation liabilities, current Cash surrender value of life insurance Core material inventory components, value Amount of security to proceed current appeal Contingency, closed and settled date Deductibles per claim Potential liability per claim Maximum aggregate claim amount Liabilities recorded Share based compensation, description Share based compensation number of shares authorized Share based compensation vesting rights Unvested units outstanding Share based compensation grants in period Share based compensation weighted average grant date fair value Share based compensation paid in period Share based compensation grants paid in period Forfeiture rate of plan Share based compensation liability Share based compensation liability, current Share based compensation liability, non-current Compensation expense Unrecognized compensation costs Compensation expense, weighted average recognize period Nonvested Units, Beginning balance Nonvested Units, Granted Nonvested Units, Vested Nonvested Units, Forfeited Nonvested Units, Canceled Nonvested Units, Ending Balance Phantom Stock Unit Awards Expected to Vest, Units Nonvested Weighted Average Grant Date Fair Value, Beginning balance Nonvested Weighted Average Grant Date Fair Value, Granted Nonvested Weighted Average Grant Date Fair Value, Vested Nonvested Weighted Average Grant Date Fair Value, Forfeited Nonvested Weighted Average Grant Date Fair Value, Canceled Nonvested Weighted Average Grant Date Fair Value, Ending Balance Phantom Stock Unit Awards Expected to Vest, Weighted Average Grant Date Fair Value Related parties amount secured by company Loss contingencies, range of possible losses Gross Profit Net Income attributable to Omega Flex, Inc. Basic and Diluted Earnings per common share Represents the monetary amount of Accrued Commissions and Sales Incentives Change, during the indicated time period. Banbury [Member] Board of Directors [Member] Buildings [Member] Customer One [Member] December 2007 [Member] Represents the monetary amount of Engineering Expense, during the indicated time period. Houston [Member] January 1, 2019 [Member] January 1, 2019 [Member] January 2018 [Member] January 2019 [Member] July 2018 [Member] July 2017 [Member] Loan Agreement [Member] Middletown [Member] New Rate [Member] October 2018 [Member] October 2017 [Member] Phantom Stock Plan [Member] Qualified Non-contributory Profit-sharing Reduced [Member] Reduction Corporate Tax [Member] Restricted Stock Unit Awards [Member] Savings and Retirement Since Inception [Member] 2018 [Member] Increase (Decrease) Lease Liability. Declared Dividends. Non-Employee Directors [Member] Libo plus one [Member]. Represents the Unvested units outstanding (number of shares), as of the indicated date. Forfeiture rate of plan. The net total number of shares (or other type of equity) under an equity-based award plan, other than a stock option plan, that were granted, vested and forfeited during the reporting period. Share based compensation arrangement by share based payment award equity instruments other than options nonvested number expected to vest. The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. Phantom Stock Unit Awards Expected to Vest, Weighted Average Grant Date Fair Value. Shipping Costs [Policy Text Block] No Other Customer [Member] Defense costs per claim. Stock repurchased during period, value per share. Income tax reconciliation, foreign derived intangible income deduction. Operating leases term, description. Core material inventory components, value. Amount of security to proceed current appeal. Deductibles per claim. Potential liability per claim. Assets, Current Assets Liabilities, Current Deferred Income Tax Liabilities, Net Liabilities Treasury Stock, Value Stockholders' Equity Attributable to Parent Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Liabilities and Equity Operating Income (Loss) Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Net Income (Loss) Attributable to Noncontrolling Interest Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Comprehensive Income (Loss), Net of Tax, Attributable to Parent Shares, Outstanding Stock Issued During Period, Value, Stock Dividend Deferred Income Tax Expense (Benefit) Increase (Decrease) in Accounts Receivable Increase (Decrease) in Inventories Increase (Decrease) in Other Operating Assets Increase (Decrease) in Accounts Payable Increase (Decrease) in Accrued Salaries Accrued Commissions and Sales Incentives Change Increase (Decrease) in Other Operating Liabilities Net Cash Provided by (Used in) Operating Activities Payments to Acquire Investments Payments to Acquire Property, Plant, and Equipment Net Cash Provided by (Used in) Investing Activities Net Cash Provided by (Used in) Financing Activities Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations Investment, Policy [Policy Text Block] Inventory, Policy [Policy Text Block] Property, Plant and Equipment, Policy [Policy Text Block] Lessee, Leases [Policy Text Block] Income Tax, Policy [Policy Text Block] Subsequent Events, Policy [Policy Text Block] Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Effective Income Tax Rate Reconciliation, Deduction, Qualified Production Activity, Amount IncomeTaxReconciliationForeignDerivedIntangibleIncomeDeduction Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount Deferred Tax Assets, Valuation Allowance Deferred Tax Assets, Gross Deferred Tax Liabilities, Deferred Expense Deferred Tax Liabilities, Property, Plant and Equipment Deferred Tax Liabilities, Gross Deferred Tax Assets, Net Operating Leases, Future Minimum Payments Due Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value