Statement of Financial Position [Abstract] Current Assets: Current Assets: [Abstract] Cash Accounts receivable, net Other receivables Cost in excess of billing Inventories Prepaid expenses Current deferred tax asset Total Current Assets Property and Equipment, net accumulated depreciation Other Assets: Other Assets: [Abstract] Other investments Long term deferred tax asset Other intangible assets Deposits Total Other Assets Total Assets Current Liabilities: Current Liabilities: [Abstract] Current portion of capital lease obligations Accounts payable Accrued expenses Billing in excess of cost Accrued income taxes payable Deferred revenue / customers deposit Total Current Liabilities Long-term capital lease obligations, less current portion Total Long-Term Liabilities Total Liabilities Stockholders' Equity: Stockholders' Equity: [Abstract] Common stock; par value $0,001, 100,000,000 shares authorized, 27,212,500 and 27,212,500 shares issued and outstanding at June 30, 2014 and December 31, 2013, respectively Additional paid-in capital Accumulated deficit Deferred compensation Other comprehensive income, net Non-controlled interest in subsidiaries Total Stockholders' Equity Total Liabilities and Stockholders' Equity Common Stock, par value (in Dollars per share) Common Stock, shares authorized Common Stock, shares issued Common Stock, shares outstanding Income Statement [Abstract] Net Sales Cost of Goods Sold Gross Profit Operating Expenses: Operating Expenses: [Abstract] Selling expenses General and administrative expenses Non-cash compensation expenses Research and development expenses Total Operating Expense Loss from Operations Other Income (Expense) Other Income (Expense) [Abstract] Interest and other income Interest (expense) Gain (loss) on investments Gain (loss) on currency transactions Loss on sale of fixed assets Total Other Income (Expense) Loss Before Income Taxes Income Tax Expense (Income) Net Loss Less Net Loss Attributable To Non-Controlled Interests in Subsidiaries Net Loss Attributable To LiqTech Basic Earnings Per Share (in Dollars per share) Weighted Average Common Shares Outstanding (in Shares) Diluted Earnings Per Share (in Dollars per share) Weighted Average Common Shares Outstanding Assuming Dilution (in Shares) Statement of Comprehensive Income [Abstract] Net Income (Loss) Currency Translation, Net of Taxes Other Comprehensive Income (Loss) Comprehensive Income (Loss) Attributable To Non-controlling Interest in Subsidiaries Comprehensive Income (Loss) Attributable To LiqTech International Inc. Statement of Cash Flows [Abstract] Cash Flows from Operating Activities: Cash Flows from Operating Activities: [Abstract] Adjustments to reconcile net income (loss) to net cash provided by operations: Adjustments to reconcile net income (loss) to net cash provided by operations: [Abstract] Depreciation and amortization Non-cash compensation Bad debt expense Obsolete inventory expense Change in deferred tax asset / liability (Gain) Loss on sale of equipment Changes in assets and liabilities: Changes in assets and liabilities: [Abstract] (Increase) decrease in accounts receivable (Increase) decrease in inventory (Increase) decrease in prepaid expenses/deposits Increase (decrease) in accounts payable Increase (decrease) in accrued expenses Increase (decrease) long term contracts Total Adjustments Net Cash Provided (Used) by Operating Activities Cash Flows from Investing Activities: Cash Flows from Investing Activities: [Abstract] Purchase of property and equipment Purchase of Long-term investments Net Cash Used by Investing Activities Cash Flows from Financing Activities: Cash Flows from Financing Activities: [Abstract] Net (payments) proceeds on capital lease obligation Net Cash Provided (Used) by Financing Activities Loss on Currency Translation Net Increase (Decrease) in Cash and Cash Equivalents Cash and Cash Equivalents at Beginning of Period Cash and Cash Equivalents at End of Period Accounting Policies [Abstract] Significant Accounting Policies [Text Block] Inventory Disclosure [Abstract] Inventory Disclosure [Text Block] Property, Plant and Equipment [Abstract] Property, Plant and Equipment Disclosure [Text Block] Investments, Debt and Equity Securities [Abstract] Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Disclosure Text Block [Abstract] Intangible Assets Disclosure [Text Block] Leases [Abstract] Leases of Lessee Disclosure [Text Block] Disclosure Text Block Supplement [Abstract] Commitments Disclosure [Text Block] Income Tax Disclosure [Abstract] Income Tax Disclosure [Text Block] Earnings Per Share [Abstract] Earnings Per Share [Text Block] Stockholders' Equity Note [Abstract] Stockholders' Equity Note Disclosure [Text Block] Segment Reporting [Abstract] Segment Reporting Disclosure [Text Block] Subsequent Events [Abstract] Subsequent Events [Text Block] Basis of Accounting, Policy [Policy Text Block] Consolidation, Policy [Policy Text Block] Foreign Currency Transactions and Translations Policy [Policy Text Block] Cash and Cash Equivalents, Policy [Policy Text Block] Loans and Leases Receivable, Allowance for Loan Losses Policy [Policy Text Block] Inventory, Policy [Policy Text Block] Property, Plant and Equipment, Policy [Policy Text Block] Investment, Policy [Policy Text Block] Goodwill and Intangible Assets, Policy [Policy Text Block] Revenue Recognition, Policy [Policy Text Block] Advertising Costs, Policy [Policy Text Block] Research, Development, and Computer Software, Policy [Policy Text Block] Income Tax, Policy [Policy Text Block] Earnings Per Share, Policy [Policy Text Block] Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Fair Value Measurement, Policy [Policy Text Block] Use of Estimates, Policy [Policy Text Block] New Accounting Pronouncements, Policy [Policy Text Block] Allowance for Credit Losses on Financing Receivables [Table Text Block] Schedule of Inventory, Current [Table Text Block] Property, Plant and Equipment [Table Text Block] Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Schedule of Future Minimum Lease Payments for Capital Leases [Table Text Block] Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule of Weighted Average Number of Shares [Table Text Block] Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block] Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding and Exercisable [Table Text Block] Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block] Reconciliation of Revenue from Segments to Consolidated [Table Text Block] Allowance for Doubtful Accounts, Roll Forward Allowance for Doubtful Accounts, Roll Forward [Abstract] Allowance for doubtful accounts at the beginning of the period Amount of receivables written off Effect of currency translation Allowance for doubtful accounts at the end of the period Summary of Inventory Summary of Inventory [Abstract] Furnace parts and supplies Raw materials Work in process Finished goods Reserve for obsolescence Net Inventory Property and Equipment Property and Equipment [Abstract] Property, Plant and Equipment, Type [Domain] Range [Domain] Property, Plant and Equipment [Table] Property, Plant and Equipment [Line Items] Useful life Property and equipment Less Accumulated Depreciation Net Property and Equipment Summary of Level 1-3 Financial Assets and Liabilities Summary of Level 1-3 Financial Assets and Liabilities [Abstract] Fair Value Hierarchy [Domain] Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Investments Total Expected Future Amortization Expense Expected Future Amortization Expense [Abstract] 2014 2015