Range [Axis] Minimum [Member] Maximum [Member] Loss Contingency Nature [Axis] Insurance Claims [Member] Award Type [Axis] Phantom Stock Plan [Member] December of 2007 [Member] Scenario [Axis] Since Inception [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] Concentration Risk Benchmark [Axis] Sales Revenue [Member] Customer [Axis] One Customer [Member] Accounts Receivable [Member] Currency [Axis] GBP [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 Filer Category Entity Common Stock, Shares Outstanding Trading symbol 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 $839 and $926, respectively Inventories-Net Other Current Assets Total Current Assets 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 Other Liabilities Total Current Liabilities Deferred Taxes Other Long Term Liabilities Total Liabilities Commitments and Contingencies (Note 5) Shareholders' Equity: Omega Flex, Inc. Shareholders' Equity: Common Stock – par value $0.01 Shares: authorized 20,000,000, issued 10,153,633 and outstanding 10,091,822 at both June 30, 2017 and December 31, 2016 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 attributable to the 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, Net of Tax: Foreign Currency Translation Adjustment, Net of Tax Other Comprehensive Income, Net of Tax Comprehensive Income Less: Comprehensive Income Attributable to the Noncontrolling Interest Total Comprehensive Income Statement [Table] Statement [Line Items] Balance Balance, shares Cumulative Translation Adjustment 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 Provision for Inventory Reserves Deferred Taxes Changes in Assets and Liabilities: Accounts Receivable Inventories Other Assets Accounts Payable Accrued Compensation Accrued Commissions and Sales Incentives Other Liabilities Net Cash Provided by Operating Activities Cash Flows from Investing Activities: Capital Expenditures Net Cash Used in Investing Activities Cash Flows from Financing Activities: Dividends Paid Net Cash Used in Financing Activities Net (Decrease) in Cash and Cash Equivalents Translation effect on cash Cash and Cash Equivalents - Beginning of Period Cash and Cash Equivalents - End of Period Supplemental Disclosure of Cash Flow Information: Cash paid for Income Taxes Cash paid for Interest Declared Dividend Accounting Policies [Abstract] Basis of Presentation and Description of Business Significant Accounting Policies Inventory Disclosure [Abstract] Inventories Debt Disclosure [Abstract] Line of Credit Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Stock Based Plans Equity [Abstract] Shareholders' Equity Related Party Transactions [Abstract] Related Party Transactions Subsequent Events [Abstract] Subsequent Events Use of Estimates Revenue Recognition Cash Equivalents Accounts Receivable and Provision For Doubtful Accounts Inventories Property and Equipment Goodwill Stock-Based Compensation Plans Product Liability Reserves Fair Value of Financial and Nonfinancial Instruments Earnings Per Common Share Currency Translation Income Taxes Other Comprehensive Income Significant Concentration Subsequent Events Recent Accounting Pronouncements Schedule of Inventories, Net of Reserves Summary of Nonvested Phantom Stock Units Defense costs per claim Concentration risk percentage Finished Goods Raw Materials Inventories-Net Line of credit facility, description Line of credit facility, maximum borrowing capacity Line of credit expiration date Line of credit facility, interest rate description Line of credit facility, commitment fee description Line of credit facility, fair value of amount outstanding Payment benefit to employee's Other compensation liabilities Other compensation liabilities, noncurrent Other compensation liabilities, current Cash surrender value of life insurance Amount of security to proceed current appeal Proceeds from legal settlements Relieved assets on books after legal settlement Allocation of proceeds from legal settlements to offset operating expenses Deductibles per claim Potential liability per claim Liabilities recorded Maximum aggregate claim amount Share based compensation 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 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 Report Date [Axis] Treasury stock, common shares Dividends payable, amount per share Dividend Paid Stock repurchase program, authorized amount Stock repurchased during period, shares Stock repurchased during period, value Stock repurchased during period, value per share Noncontrolling interest amount secured for future distributions Represents the monetary amount of Accrued Commissions and Sales Incentives Change, during the indicated time period. Represents the monetary amount of Allocation of Proceeds from Legal Settlements to Offset Operating Expenses, during the indicated time period. Amount of security to proceed current appeal. Represents the monetary amount of Assets on books after legal settlement, as of the indicated date. December of 2007 [Member] Deductibles per claim. Defense costs per claim. Represents the monetary amount of Engineering Expense, during the indicated time period. Forfeiture rate of plan. One Customer [Member] Payments of dividend. Phantom Stock Plan [Member] Potential liability per claim. 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. Phantom Stock Unit Awards Expected to Vest, Weighted Average Grant Date Fair Value. 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. Since Inception [Member] Stock repurchased during period, value per share. GBP [Member] Represents the Unvested units outstanding (number of shares), as of the indicated date. Assets, Current Assets Liabilities, Current Deferred Tax Liabilities, Net Liabilities Treasury Stock, Value Stockholders' Equity Attributable to Parent Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Liabilities and Equity Gross Profit Operating Income (Loss) Other Nonoperating Expense Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Income (Loss) Attributable to Noncontrolling Interest, before Tax Net Income (Loss) Attributable to Parent Other Comprehensive Income, Other, Net of Tax 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 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 Property, Plant, and Equipment Net Cash Provided by (Used in) Investing Activities PaymentsOfDividend Net Cash Provided by (Used in) Financing Activities Cash and Cash Equivalents, Period Increase (Decrease) Inventory, Policy [Policy Text Block] Subsequent Events, Policy [Policy Text Block] 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, Nonvested, Weighted Average Grant Date Fair Value Payments of Dividends