LiqTech International (LIQT) 10-K 1 Apr 19 2018 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2018	Mar. 29, 2019	Jun. 30, 2018
Document Information [Line Items]
Entity Registrant Name	LIQTECH INTERNATIONAL INC
Entity Central Index Key	0001307579
Trading Symbol	liqt
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	No
Entity Emerging Growth Company	false
Entity Small Business	true
Entity Common Stock, Shares Outstanding (in shares)		73,078,184
Entity Public Float			$ 52,533,852
Entity Shell Company	false
Document Type	10-K
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY
Amendment Flag	false

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Current Assets:
Cash	$ 3,776,111	$ 2,486,199
Accounts receivable, net	1,308,122	1,124,842
Other receivables	1,098,796	636,539
Contract assets	624,275	490,100
Inventories, net	4,432,055	4,661,866
Prepaid expenses	133,847	28,151
Total Current Assets	11,373,206	9,427,697
Property and Equipment, net	1,431,649	1,959,205
Other Assets:
Investments at costs	5,714	6,001
Other intangible assets	748	3,349
Deposits	347,932	283,686
Total Other Assets	354,394	293,036
Total Assets	13,159,249	11,679,938
Current Liabilities:
Current portion of capital lease obligations	13,789	26,186
Accounts payable	2,122,479	1,775,230
Accrued expenses	1,868,229	1,725,566
Contract liabilities	516,335	306,845
Deferred revenue / customers deposits	98,781	933,994
Total Current Liabilities	4,619,613	4,767,821
Total Liabilities	4,619,613	4,767,821
Commitment and Contingencies (See Note 8)
Stockholders' Equity:
Series A Mandatory Convertible Preferred stock; par value $0.001, 10,000,000 shares authorized, 0 and 2,200,837 shares issued and outstanding at December 31, 2018 and December 31, 2017, respectively		2,201
Common stock; par value $0.001, 100,000,000 shares authorized 72,915,547 and 44,229,264 shares issued and outstanding at December 31, 2018 and December 31, 2017, respectively	72,916	44,430
Additional paid-in capital	46,521,299	40,457,907
Accumulated deficit	(32,286,224)	(28,471,696)
Deferred compensation	(23,499)	(79,933)
Accumulated other comprehensive loss	(5,744,856)	(5,040,792)
Total Stockholders' Equity	8,539,636	6,912,117
Total Liabilities and Stockholders' Equity	$ 13,159,249	$ 11,679,938

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parentheticals) - $ / shares	Dec. 31, 2018	Dec. 31, 2017
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Preferred stock, shares issued (in shares)	0	2,200,837
Preferred stock, shares outstanding (in shares)	0	2,200,837
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	72,915,547	44,229,264
Common stock, shares outstanding (in shares)	72,915,547	44,229,264

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Net Sales	$ 12,232,088	$ 11,343,177
Cost of Goods Sold	11,165,944	11,136,426
Gross Profit	1,066,144	206,751
Operating Expenses:
Selling expenses	1,703,327	1,944,989
General and administrative expenses	3,187,311	2,332,169
Research and development expenses	661,014	536,848
Total Operating Expense	5,551,652	4,814,006
Loss from Operations	(4,485,508)	(4,607,255)
Other Income (Expense)
Interest and other income	28,401	1,515
Interest expense	(71,781)	(45,888)
Gain (loss) on currency transactions	344,023	(102,470)
Gain (loss) on sale of fixed assets	4,907	(24,065)
Total Other Income (Expense)	305,550	(170,908)
Loss Before Income Taxes	(4,179,958)	(4,778,163)
Income Tax Expense (Benefit)	(365,430)	(317,810)
Net Loss	$ (3,814,528)	$ (4,460,353)
Basic and Diluted Loss Per Share (in dollars per share)	$ (0.06)	$ (0.11)
Weighted Average Common Shares Outstanding (in shares)	63,843,634	41,595,856

Consolidated Statements of Othe

Consolidated Statements of Other Comprehensive Income (Loss) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Net Loss	$ (3,814,528)	$ (4,460,353)
Other Comprehensive Income (loss) - Currency Translation, Net	(704,064)	650,509
Total Comprehensive Loss	$ (4,518,592)	$ (3,809,844)

Consolidated Statement of Stock

Consolidated Statement of Stockholders' Equity - USD ($)	Convertible Preferred Stock [Member]Preferred Stock [Member]	Convertible Preferred Stock [Member]Common Stock [Member]	Convertible Preferred Stock [Member]Additional Paid-in Capital [Member]	Convertible Preferred Stock [Member]Retained Earnings [Member]	Convertible Preferred Stock [Member]AOCI Attributable to Parent [Member]	Convertible Preferred Stock [Member]Deferred Compensation, Share-based Payments [Member]	Issuance 1 [Member]Board of Directors Chairman [Member]Preferred Stock [Member]	Issuance 1 [Member]Board of Directors Chairman [Member]Common Stock [Member]	Issuance 1 [Member]Board of Directors Chairman [Member]Additional Paid-in Capital [Member]	Issuance 1 [Member]Board of Directors Chairman [Member]Retained Earnings [Member]	Issuance 1 [Member]Board of Directors Chairman [Member]AOCI Attributable to Parent [Member]	Issuance 1 [Member]Board of Directors Chairman [Member]Deferred Compensation, Share-based Payments [Member]	Issuance 2 [Member]Board of Directors Chairman [Member]Preferred Stock [Member]	Issuance 2 [Member]Board of Directors Chairman [Member]Common Stock [Member]	Issuance 2 [Member]Board of Directors Chairman [Member]Additional Paid-in Capital [Member]	Issuance 2 [Member]Board of Directors Chairman [Member]Retained Earnings [Member]	Issuance 2 [Member]Board of Directors Chairman [Member]AOCI Attributable to Parent [Member]	Issuance 2 [Member]Board of Directors Chairman [Member]Deferred Compensation, Share-based Payments [Member]	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Deferred Compensation, Share-based Payments [Member]	Total
BALANCE (in shares) at Dec. 31, 2016																				36,835,514
BALANCE at Dec. 31, 2016																				$ 36,836	$ 36,084,117	$ (24,011,343)	$ (5,691,301)	$ (148,561)
Common shares issued, net offering cost (in shares)																				7,300,000
Common shares issued, net offering cost																				$ 7,300	1,752,700
Conversion of mandatory preferred stock issued (in shares)	2,200,837
Conversion of mandatory preferred stock issued	$ 2,201		$ 2,511,067
Common shares issued, for services provided (in shares)								93,750						200,000
Common shares issued, for services provided								$ 94	$ 59,906			$ (60,000)		$ 200	$ 69,800			$ (70,000)
Forfeiture of Stock Based Compensation																					(19,683)			19,684
Stock based compensation expenses recognized for the year																								178,944
Other Comprehensive Income (loss) - Currency Translation, Net																							650,509		$ 650,509
Net Loss																						(4,460,353)			(4,460,353)
BALANCE (in shares) at Dec. 31, 2017																			2,200,837	44,429,264
BALANCE at Dec. 31, 2017																			$ 2,201	$ 44,430	40,457,907	(28,471,696)	(5,040,792)	(79,933)
Common shares issued, net offering cost (in shares)																				19,448,529
Common shares issued, net offering cost																				$ 19,449	5,845,628
Conversion of mandatory preferred stock issued (in shares)																			(2,200,837)	8,803,348
Conversion of mandatory preferred stock issued																			$ (2,201)	$ 8,803	(6,602)
Common shares issued, for services provided (in shares)								59,406
Common shares issued, for services provided								$ 59	$ 59,941
Stock based compensation expenses recognized for the year																								56,434
Other Comprehensive Income (loss) - Currency Translation, Net																							(704,064)		(704,064)
Net Loss																						(3,814,528)			$ (3,814,528)
Exercising of stock options (in shares)																				175,000					175,000
Exercising of stock options																				$ 175	164,425
BALANCE (in shares) at Dec. 31, 2018																				72,915,547
BALANCE at Dec. 31, 2018																				$ 72,916	$ 46,521,299	$ (32,286,224)	$ (5,744,856)	$ (23,499)

Consolidated Statement of Sto_2

Consolidated Statement of Stockholders' Equity (Parentheticals) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Common Stock [Member] | Issuance 1 [Member] | Board of Directors Chairman [Member]
Shares issued, price per share (in dollars per share)	$ 1.01	$ 0.64
Common Stock [Member] | Issuance 2 [Member] | Board of Directors Chairman [Member]
Shares issued, price per share (in dollars per share)		0.35
Common Stock [Member]
Shares issued, price per share (in dollars per share)	$ 0.34	$ 0.25
Shares issued, offering cost	$ 747,423	$ 65,000
Convertible Preferred shares, convertible securities (in shares)	4
Preferred Stock [Member] | Convertible Preferred Stock [Member]
Shares issued, price per share (in dollars per share)		$ 1.20
Shares issued, offering cost		$ 127,736
Convertible Preferred shares, convertible securities (in shares)		8,803,348
Shares issued, offering cost	$ 747,423	$ 192,736

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Cash Flows from Operating Activities:
Net Loss	$ (3,814,528)	$ (4,460,353)
Adjustments to reconcile net (loss) to net cash provided (used) by operations:
Depreciation and amortization	648,734	939,500
Non-cash compensation	116,434	178,944
Bad debt expense	353,562	(102,189)
Reserve for obsolete inventory	207,384	(206,155)
Gain on sale of equipment	(4,907)	24,065
Changes in assets and liabilities:
Accounts receivable	(999,099)	(241,256)
Contracts assets	(134,175)
Inventory	32,241	564,359
Prepaid expenses	(184,009)	41,314
Accounts payable	347,249	(487,458)
Accrued expenses	(692,550)	80,797
Contract liabilities	209,490	353,070
Total Adjustments	(99,646)	1,144,991
Net Cash used in Operating Activities	(3,914,174)	(3,315,362)
Cash Flows from Investing Activities:
Purchase of property and equipment	(178,872)	(137,674)
Proceeds from sale/recovery of property and equipment	7,982	14,001
Net Cash used in Investing Activities	(170,890)	(123,673)
Cash Flows from Financing Activities:
Net payments on capital lease obligation	(12,397)	(113,639)
Payments on loans payable		(54,929)
Proceeds from issuance of mandatory convertible preferred stock		2,641,004
Payment of stock offering costs	(747,423)	(192,736)
Proceeds from issuance of common stock	6,777,100	1,825,000
Net Cash Provided by Financing Activities	6,017,280	4,104,700
Loss on Currency Translation	(642,304)	611,884
Change in Cash and Cash Equivalents	1,289,912	1,277,549
Cash and Cash Equivalents at Beginning of Period	2,486,199	1,208,650
Cash and Cash Equivalents at End of Period	3,776,111	2,486,199
Supplemental Disclosures of Cash Flow Information:
Interest	44,604	45,888
Income Taxes	$ 570	$ 580

Note 1 - Summary of Significant

Note 1 - Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Significant Accounting Policies [Text Block]	NOTE 1 Business and Basis of Presentation The consolidated financial statements include the accounts of LiqTech International, Inc. (“Parent”) and its subsidiaries. The terms "Company", “us", "we" and "our" as used in this Annual report refer to Parent and its subsidiaries, which are set forth below. The Company engages in the development, design, production, marketing and sale of automated filtering systems, ceramic silicon carbide liquid and diesel particulate air filters in United States, Canada, Europe, Asia and South America. Set forth below is a description of Parent and each of its subsidiaries: LiqTech International, Inc., a Nevada corporation organized in July 2004, LiqTech USA, a Delaware corporation and a wholly-owned subsidiary of Parent formed in May 2011. LiqTech International AS, a Danish corporation, incorporated on January 15, 2000 ( 100% LiqTech NA, Inc. (“LiqTech NA”), incorporated in Delaware on July 1, 2005, 100% LiqTech Systems AS, a Danish Corporation ("LiqTech Systems") (Formerly Provital Solutions A/S) was incorporated on September 1, 2009 LiqTech Germany (“LiqTech Germany”) a 100% December 9, 2011, 2019. LiqTech PTE Ltd, (“LiqTech Sing”) a 95% January 19, 2012, 2019. Consolidation -- Functional Currency / Foreign currency translation -- December 31, 2018 2017. Reclassification – no Cash, Cash Equivalents and Restricted Cash -- three no December 31, 2018 December 31, 2017. Accounts Receivable -- The roll forward of the allowance for doubtful accounts for the year ended December 31, 2018 December 31, 2017 201 8 201 7 Allowance for doubtful accounts at the beginning of the period $ 660,581 $ 2,128,452 Bad debt expense 353,562 (102,189 ) Receivables written off during the periods - (1,678,856 ) Effect of currency translation (42,371 ) 313,174 Allowance for doubtful accounts at the end of the period $ 971,772 $ 660,581 Inventory -- first first Property and Equipment -- three ten 3 Long-Term Investments -- may may not may Long Lived Assets may not Revenue Recognition and Sales Incentives -- January 1, 2018, 606, 2015, 2016 2017 January 1, 2018. not not For membrane and DPF product sale, revenue is recognized when performance obligations under the terms of a contract with the customer are satisfied which occurs when control of the membrane, DPF or services are transferred to the customer. The majority of the Company's sales contracts contain performance obligations satisfied at a point in time when title and risks and rewards of ownership have transferred to the customer. This generally occurs when the product is shipped or accepted by the customer. Revenue for service contracts are recognized as the services are provided. Revenue is measured as the amount of consideration expected to be received in exchange for transferring the goods or providing services. The satisfaction of performance obligations under the terms of a revenue contract generally gives rise for the right to payment from the customer. The Company's standard payment terms vary by the type and location of the customer and the products or services offered. Generally, the time between when revenue is recognized and when payment is due is not not For contracts with customers that include multiple performance obligations, judgment is required to determine whether performance obligations specified in these contracts are distinct and should be accounted for as separate revenue transactions for recognition purposes. For such arrangements, revenue is allocated to each performance obligation based on its relative standalone selling price. Standalone selling prices are generally determined based on the prices charged to customers or using expected cost-plus margin. System sales are recognized when the Company transfers control based upon signed acceptance of the system by the customer upon shipment of the system based on the terms of the contract. For the majority of Systems, the Company transfers control and recognizes revenue when products are shipped to the customer according to the terms of the contract or purchase order. In connection with the system it is normal procedure to issue a FAT (Factory Acceptance Test) stating that the customer has accepted the performance of the system as it is being shipped from the production facility in Hobro. As part of the delivery performance, the customer is normally offered a commissioning (a final assembly and configuration at a place designated by the customer) and this commission is therefore considered a second second first Aftermarket sales represent part sales, extended warranty and maintenance services. For the sale of aftermarket parts, the Company transfers control and recognizes revenue when parts are shipped to the customer or services are provided. When customers are given the right to return eligible parts and accessories, the Company estimates the expected returns based on an analysis of historical experience. The Company adjusts estimated revenues at the earlier of when the most likely amount of consideration expected to be received changes or when the consideration becomes fixed. The Company recognizes revenue for extended warranty and maintenance agreements based on the standalone selling price over the life of the contract, which reflects the costs to perform under these contracts, which corresponds with, and thereby depicts the transfer of control to the customer. For invoicing to customers where the transfer of control has not The Company has received long-term contracts for grants from government entities for development and use of silicon carbide membranes in various water filtration and treatment applications and historically in the installation of various water filtrations systems. We measure transfer of control of the performance obligation on long-term contracts utilizing the cost-to-cost measure of progress, with cost of revenue including direct costs, such as labor and materials. Under the cost-to-cost approach, the use of estimated costs to complete each performance obligation is a significant variable in the process of determining recognized revenue and a significant factor in the accounting for such performance obligations. The timing of when we bill our customers is generally dependent upon advance billings terms, milestone billings based on completion of certain phases of the work or when services are provided, or products are shipped. Projects with performance obligations recognized over time that have costs and estimated earnings recognized to date in excess of cumulative billings are reported on our Balance Sheets as contract assets. Projects with performance obligations recognized over time that have cumulative billings in excess of costs and estimated earnings recognized to date are reported on our Balance Sheets as contract liabilities. In Denmark, Value Added Tax (“VAT”) of 25% not Advertising Cost -- $38,951 $16,350, December 31, 2018 2017, Research and Development Cost -- December 31, 2018 2017 $661,014, $536,848, Income Taxes -- 740 Loss Per Share -- 260 not Stock Options and Awards -- 11. 718, $56,434 $178,944 Fair Value of Financial Instruments -- 820. three ● Level 1. ● Level 2. ● Level 3. no Unless otherwise disclosed, the fair value of the Company’s financial instruments including cash, accounts receivable, other receivables, prepaid expenses, investments, accounts payable, accrued expenses, capital lease obligations and notes payable approximates their recorded values due to their short-term maturities. Accounting Estimates -- Recent Accounting Pronouncements -- February 25, 2016, 2016 02, December 15, 2018. 7. not In June 2018, No. 2018 07, 718 2018 07” 2018 07 718 Other recent accounting pronouncements issued by the FASB did not not

Note 2 - Inventory

Note 2 - Inventory	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Inventory Disclosure [Text Block]	NOTE 2 - INVENTORY Inventory consisted of the following at December 31, 2018 December 31, 2017: 201 8 201 7 Furnace parts and supplies $ 596,806 $ 400,589 Raw materials 1,659,826 1,260,209 Work in process 1,691,175 2,123,418 Finished goods and filtration systems 1,596,042 2,297,743 Reserve for obsolescence (1,111,794 ) (1,420,093 ) Net Inventory $ 4,432,055 $ 4,661,866 A portion of the inventory, $4,011,203, 6.

Note 3 - Property and Equipment

Note 3 - Property and Equipment	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Property, Plant and Equipment Disclosure [Text Block]	NOTE 3 - PROPERTY AND EQUIPMENT Property and equipment consisted of the following at December 31, 2018 December 31, 2017: Useful Life 201 8 201 7 Production equipment 3 - 10 $ 9,614,189 $ 10,114,398 Lab equipment 3 - 10 82,930 87,094 Computer equipment 3 - 5 204,807 204,553 Vehicles 3 - 5 71,711 75,312 Furniture and fixture 5 111,417 106,047 Leasehold improvements 10 1,037,678 1,076,731 11,122,732 11,664,135 Less Accumulated Depreciation (9,691,083 ) (9,704,930 ) Net Property and Equipment $ 1,431,649 $ 1,959,205 Depreciation expense amounted to $819,070 $937,235, December 31, 2018 2017, 6.

Note 4 - Investments at Cost

Note 4 - Investments at Cost	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]	NOTE 4 – INVESTMENTS AT COST The following tables summarize Level 1, 2 3 As of December 31, 2018 Level 1 Level 2 Level 3 Investments - - 5,714 Total - - 5,714 As of December 31, 2017 Level 1 Level 2 Level 3 Investments - - 6,001 Total - - 6,001 At December 31, 2018, December 31, 2017, $5,714 $6,001 5,000

Note 5 - Definite-life Intangib

Note 5 - Definite-life Intangible Assets	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Intangible Assets Disclosure [Text Block]	NOTE 5 - DEFINITE-LIFE INTANGIBLE ASSETS At December 31, 2018 December 31, 2017, $748 $3,349, ten December 31, 2018 2017 $2,519 $2,265, Year ending December 31, Amortization Expenses 2019 748 Thereafter - $ 748

Note 6 - Lines of Credit

Note 6 - Lines of Credit	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Debt Disclosure [Text Block]	NOTE 6 - LINES OF CREDIT In connection with certain orders, we have to give the customer a working guarantee or a prepayment guarantee or security bond. For that purpose, we have a guarantee line of DKK 94,620 $14,514 December 31, 2018) December 31, 2018, 94,620 $14,514 no

Note 7 - Leases

Note 7 - Leases	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Leases of Lessee Disclosure [Text Block]	NOTE 7 - LEASES Operating Leases -- 12 February 2021 August 2024 The future minimum lease payments for non-cancelable operating leases having remaining terms in excess of one December 31, 2018 Year ending December 31, Lease Payments 2019 712,250 2020 578,997 2021 402,584 2022 350,249 Thereafter 560,977 Total Minimum Lease Payments $ 2,605,057 Lease expense charged to operations was $642,546 $651,032, December 31, 2018, 2017. Capital Leases -- $2,093 July 2019. Included in property and equipment, at December 31, 2018 December 31, 2017, $1,182,778 $1,328,672, $1,169,272 $1,301,870, December 31, 2018 2017, $11,180, $39,623, December 31, 2018 2017, $5,021 $6,290, Future minimum capital lease payments are as follows for the years ended December 31: Year ending December 31, Lease Payments 2019 14,654 Thereafter - Total minimum lease payments 14,654 Less amount representing interest (865 ) Present value of minimum lease payments 13,789 Less Current Portion (13,789 ) $ -

Note 8 - Agreements, Commitment

Note 8 - Agreements, Commitments and Contingencies	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Commitments and Contingencies Disclosure [Text Block]	NOTE 8 - AGREEMENTS, COMMITMENTS AND CONTINGENCIES 401 401 December 31, 2018 2017, $11,691 $11,347, Contingencies -- may On November 20, 2018 DKK448,500 $68,800 2016 not No December 31, 2018 not On February 27, 2019, DKK543,905 $83,400 2017, 2018. no December 31, 2018. On December 2017, 2018 On September 9, 2014, 60% 40% 750,000 2018 On December 20, 2017, $1,098,678 2018 EUR380,000 Q4 2018. In connection with certain orders, we have to give the customer a working guarantee or a prepayment guarantee or security bond. For that purpose, we have a guarantee line of DKK 94,620 $14,514 December 31, 2018) December 31, 2018, 94,620 $14,514 no

Note 9 - Income Taxes

Note 9 - Income Taxes	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Income Tax Disclosure [Text Block]	NOTE 9 - INCOME TAXES The Company accounts for income taxes in accordance with FASB ASC Topic 740, two first not second 50%, As of December 31, 2018, $15,749,964 2037; $7,454,447 not $475,161 not $617,359 not As of December 31, 2018 December 31, 2017, $3,293,000 $2,833,000 $1,892,000 $1,850,000 $132,000 $139,000 $105,000 $110,000 not not December 31, 2018 $460,000, $42,000, 7,000 5,000 December 31, 2017 709,000 $755,000, $17,000 $13,000 The temporary differences, tax credits and carry forwards gave rise to the following deferred tax asset (liabilities) at December 31, 2018 December 31, 2017: 201 8 201 7 Vacation accrual $ 3,814 $ 2,900 Allowance for doubtful accounts 734 743 Reserve for obsolete inventory 241,624 305,425 Business tax credit carryover - 30,935 Deferred Compensation 24,451 16,787 Net operating loss carryover 5,184,992 4,646,434 Excess of book over tax depreciation (33,182 ) (71,116 ) Valuation allowance (5,422,432 ) (4,932,108 ) Long term deferred tax asset $ - $ - A reconciliation of income tax expense at the federal statutory rate to income tax expense at the Company’s effective rate is as follows for the years ended December 31, 2018 2017: 201 8 201 7 Computed tax at expected statutory rate $ (877,791 ) $ (1,624,575 ) State and local income taxes, net of federal benefit (9 ) (4,350 ) Non-US income taxed at different rates (15,535 ) 256,207 Effect of change in corporate tax rate 321,925 994,336 ) Non-deductible expenses 14,580 4,664 Valuation allowance 193,584 75,156 Other (2,184 ) (19,248 ) Income tax expense (benefit) $ (365,430 ) $ (317,810 ) The components of income tax expense (benefit) from continuing operations for the years ended December 31, 2018 2017 201 8 201 7 Current income tax expense: Danish $ (365,430 ) $ (317,810 ) Federal - - State - - Current tax (benefit) $ (365,430 ) $ (317,810 ) Book in excess of tax depreciation $ (40,231 ) $ (225,111 ) Allowance for doubful accounts - 459 Net operating loss carryover (729,928 ) 260,540 Valuation allowance 704,876 75,156 Deferred compensation 13,127 (8,287 ) Accrued vacation (949 ) 2,550 Reserve for obsolete inventory 53,105 (105,307 ) Deferred tax expense (benefit) $ - $ - Total tax expense (benefit) $ (365,430 ) $ (317,810 ) Deferred income tax expense / (benefit) results primarily from the reversal of temporary timing differences between tax and financial statement income. The Company files Danish and U.S. federal and Minnesota state income tax returns. LiqTech International AS and LiqTech Systems AS are generally no 2014 no 2014

Note 10 - Earnings Per Share

Note 10 - Earnings Per Share	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Earnings Per Share [Text Block]	NOTE 1 0 - EARNINGS PER SHARE The following data shows the amounts used in computing earnings per share and the effect on income and the weighted average number of shares of potential dilutive common stock for the year ended December 31, 2018 2017: For the Year Ended December 31 201 8 201 7 Net Loss attributable to LiqTech International Inc. $ (3,814,528 ) $ (4,460,353 ) Weighted average number of common shares used in basic earnings per share 63,843,634 41,595,856 Effect of dilutive securities, stock options and warrants - - Weighted average number of common shares and potential dilutive common shares outstanding used in dilutive earnings per share 63,843,634 41,595,856 For the year ended December 31, 2018, 280,000 $0.74 400,000 $1.65 not For the year ended December 31, 2017, 455,000 $0.74 $1.01 400,000 $1.65 not 2,200,837shares 8,803,348 May 14, 2018. 2,200,837 not December 31, 2017

Note 11 - Stockholders' Equity

Note 11 - Stockholders' Equity	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Stockholders' Equity Note Disclosure [Text Block]	NOTE 1 1 - STOCKHOLDERS' EQUITY Common Stock -- 100,000,000 $0.001 December 31, 2018 2017, 72,915,547 44,229,264 Voting -- one not Dividends -- may may Liquidation Rights -- Other Matters -- no no Preferred Stock -- one may may The Company has 10,000,000 $0.001 December 31, 2018, 2017 0 2,200,837 Stock Issuance s On January 2, 2018, 59,406 $60,000 December 31, 2018. On April 16, 2018, 19,448,529 $0.34 $5,865,077. On November 22, 2017, 2,200,837 1 4 8,803,348 $1.20 $2,641,004, $127,736. May 17, 2018, 2,200,837 4 8,803,348 On October 16, 2018 130,000 2015. $1.01 $131,300. On September 19 November 27, 2018, 45,000 2015. $0.74 $33,300. As of December 31, 2018 2017, $100,667 $90,833 Common Stock Purchase Warrants A summary of the status of the warrants outstanding at December 31, 2018 Warrants Outstanding Warrants Exercisable Exercise Prices Number Weighted Weighted Exercise Number Weighted $ 1.65 400,000 0.57 $ 1.65 400,000 $ 1.65 Total 400,000 0.57 $ 1.65 400,000 $ 1.65 At December 31, 2018 2017, zero $0 $17,634 December 31, 2018 2017 The exercise price of the warrants and the number of shares underlying the warrants are subject to adjustment for stock dividends, subdivisions of the outstanding shares of common stock and combinations of the outstanding shares of common stock. For so long as the warrants remain outstanding, we are required to keep reserved from our authorized and unissued shares of common stock a sufficient number of shares to provide for the issuance of the shares underlying the warrants. Stock Options In August 2015, December 31, 2018, 280,000 The Company recognizes compensation costs for stock option awards to employees based on their grant-date fair value. The value of each stock option is estimated on the date of grant using the Black-Scholes option-pricing model. The Company recognized stock-based compensation expense related to the options of $15,767 $70,477 December 31, 2018 2017, December 31, 2018, $0 August 13, 2020. A summary of the status of the options outstanding under the Company’s stock option plans at December 31, 2018 Options Outstanding Options Exercisable Exercise Number Weighted Life (years) Weighted Number Weighted $ 0.74 280,000 1.62 $ 0.74 280,000 $ 0.74 Total 280,000 1.62 $ 0.74 280,000 $ 0.74 A summary of the status of the options at December 31, 2018, December 31, 201 8 Shares Weighted Average Weighted Outstanding at beginning of period 455,000 $ 0.82 5.15 $ - Granted - - - - Exercised (175,000 ) - - - Forfeited - - - - Expired - - - - Outstanding at end of period 280,000 $ 0.34 1.62 $ - Vested and expected to vest 280,000 $ 0.34 1.62 $ - Exercisable end of period 280,000 $ 0.34 1.62 $ - At December 31, 2018, zero

Note 12 - Significant Customers

Note 12 - Significant Customers / Concentration	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Segment Reporting Disclosure [Text Block]	NOTE 1 2 - SIGNIFICANT CUSTOMERS / CONCENTRATION For the year ended December 31, 2018, four 10%, 9%, 6% 5%, 31% December 31, 2017, four 16%, 10%, 7% 5%, 38% The Company sells products throughout the world; sales by geographical region are as follows for the year ended December 31, 2018 2017: For the Year Ended December 31 2018 2017 United States and Canada $ 922,245 $ 1,115,447 Australia 597,214 640,322 South America 49,861 89,438 Asia 1,369,735 1,608,822 Europe 9,293,033 7,889,148 $ 12,232,088 $ 11,343,177 The Company’s sales by product line are as follows for the year ended December 31, 2018 2017: For the Year Ended December 31 2018 2017 Ceramic diesel particulate $ 6,536,085 $ 7,230,416 Liquid filters and systems 5,264,663 3,529,360 Development projects 431,340 458,064 Kiln furniture - 125,337 $ 12,232,088 $ 11,343,177 As of December 31, 2018, 91% 9% December 31, 2017, 87% 13%

Note 13 - Subsequent Event

Note 13 - Subsequent Event	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Subsequent Events [Text Block]	NOTE 1 3 - SUBSEQUENT EVENT The Company’s management reviewed material events through March 29, 2019. On February 25, 2019, 146,405 $82,595 December 31, 2018. On February 25, 2019, 36,232 $75,000 On January 16, January 22, February 4 February 14, 2019 180,000 2015. $0.74 $133,200.

Schedule II - Valuation and Qua

Schedule II - Valuation and Qualifying Accounts	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]	a. Valuation and Qualifying Accounts for the years ended December 31, 2018 December 31, 2017. 201 8 201 7 Bad debt expense 353,562 (102,189 ) Reserve for obsolete inventory 251,920 (206,155 ) Balance Beginning of Year Charges to Costs and Expenses Deductions (1) Balance End of Year Year Ended December 31, 2018 Allowance for inventory obsolescence $ 1,409,074 $ 251,920 $ (549,199 ) $ 1,111,795 Allowance for doubtful accounts 660,581 353,562 (42,371 ) 971,772 Totals $ 2,069,655 $ 605,482 $ (591,570 ) $ 2,083,567 Year Ended December 31, 2017 Allowance for inventory obsolescence $ 1,421,345 $ (206,155 ) $ 193,884 $ 1,409,074 Allowance for doubtful accounts 2,128,452 (102,189 ) (1,365,682 ) 660,581 Totals $ 3,549,797 $ (308,344 ) $ (1,171,798 ) $ 2,069,655 201 8 201 7 Allowance for doubtful accounts at the beginning of the period $ 660,581 $ 2,128,452 Bad debt expense 353,562 (102,189 ) Receivables written off during the period - (1,678,856 ) Effect of currency translation (42,371 ) 313,174 Allowance for doubtful accounts at the end of the period $ 971,772 $ 660,581 ( 1

Significant Accounting Policies

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Basis of Accounting, Policy [Policy Text Block]	Business and Basis of Presentation The consolidated financial statements include the accounts of LiqTech International, Inc. (“Parent”) and its subsidiaries. The terms "Company", “us", "we" and "our" as used in this Annual report refer to Parent and its subsidiaries, which are set forth below. The Company engages in the development, design, production, marketing and sale of automated filtering systems, ceramic silicon carbide liquid and diesel particulate air filters in United States, Canada, Europe, Asia and South America. Set forth below is a description of Parent and each of its subsidiaries: LiqTech International, Inc., a Nevada corporation organized in July 2004, LiqTech USA, a Delaware corporation and a wholly-owned subsidiary of Parent formed in May 2011. LiqTech International AS, a Danish corporation, incorporated on January 15, 2000 ( 100% LiqTech NA, Inc. (“LiqTech NA”), incorporated in Delaware on July 1, 2005, 100% LiqTech Systems AS, a Danish Corporation ("LiqTech Systems") (Formerly Provital Solutions A/S) was incorporated on September 1, 2009 LiqTech Germany (“LiqTech Germany”) a 100% December 9, 2011, 2019. LiqTech PTE Ltd, (“LiqTech Sing”) a 95% January 19, 2012, 2019.
Consolidation, Policy [Policy Text Block]	Consolidation --
Foreign Currency Transactions and Translations Policy [Policy Text Block]	Functional Currency / Foreign currency translation -- December 31, 2018 2017.
Reclassification, Policy [Policy Text Block]	Reclassification – no
Cash and Cash Equivalents, Policy [Policy Text Block]	Cash, Cash Equivalents and Restricted Cash -- three no December 31, 2018 December 31, 2017.
Loans and Leases Receivable, Allowance for Loan Losses Policy [Policy Text Block]	Accounts Receivable -- The roll forward of the allowance for doubtful accounts for the year ended December 31, 2018 December 31, 2017 201 8 201 7 Allowance for doubtful accounts at the beginning of the period $ 660,581 $ 2,128,452 Bad debt expense 353,562 (102,189 ) Receivables written off during the periods - (1,678,856 ) Effect of currency translation (42,371 ) 313,174 Allowance for doubtful accounts at the end of the period $ 971,772 $ 660,581
Inventory, Policy [Policy Text Block]	Inventory -- first first
Property, Plant and Equipment, Policy [Policy Text Block]	Property and Equipment -- three ten 3
Investment, Policy [Policy Text Block]	Long-Term Investments -- may may not may
Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block]	Long Lived Assets may not
Revenue from Contract with Customer [Policy Text Block]	Revenue Recognition and Sales Incentives -- January 1, 2018, 606, 2015, 2016 2017 January 1, 2018. not not For membrane and DPF product sale, revenue is recognized when performance obligations under the terms of a contract with the customer are satisfied which occurs when control of the membrane, DPF or services are transferred to the customer. The majority of the Company's sales contracts contain performance obligations satisfied at a point in time when title and risks and rewards of ownership have transferred to the customer. This generally occurs when the product is shipped or accepted by the customer. Revenue for service contracts are recognized as the services are provided. Revenue is measured as the amount of consideration expected to be received in exchange for transferring the goods or providing services. The satisfaction of performance obligations under the terms of a revenue contract generally gives rise for the right to payment from the customer. The Company's standard payment terms vary by the type and location of the customer and the products or services offered. Generally, the time between when revenue is recognized and when payment is due is not not For contracts with customers that include multiple performance obligations, judgment is required to determine whether performance obligations specified in these contracts are distinct and should be accounted for as separate revenue transactions for recognition purposes. For such arrangements, revenue is allocated to each performance obligation based on its relative standalone selling price. Standalone selling prices are generally determined based on the prices charged to customers or using expected cost-plus margin. System sales are recognized when the Company transfers control based upon signed acceptance of the system by the customer upon shipment of the system based on the terms of the contract. For the majority of Systems, the Company transfers control and recognizes revenue when products are shipped to the customer according to the terms of the contract or purchase order. In connection with the system it is normal procedure to issue a FAT (Factory Acceptance Test) stating that the customer has accepted the performance of the system as it is being shipped from the production facility in Hobro. As part of the delivery performance, the customer is normally offered a commissioning (a final assembly and configuration at a place designated by the customer) and this commission is therefore considered a second second first Aftermarket sales represent part sales, extended warranty and maintenance services. For the sale of aftermarket parts, the Company transfers control and recognizes revenue when parts are shipped to the customer or services are provided. When customers are given the right to return eligible parts and accessories, the Company estimates the expected returns based on an analysis of historical experience. The Company adjusts estimated revenues at the earlier of when the most likely amount of consideration expected to be received changes or when the consideration becomes fixed. The Company recognizes revenue for extended warranty and maintenance agreements based on the standalone selling price over the life of the contract, which reflects the costs to perform under these contracts, which corresponds with, and thereby depicts the transfer of control to the customer. For invoicing to customers where the transfer of control has not The Company has received long-term contracts for grants from government entities for development and use of silicon carbide membranes in various water filtration and treatment applications and historically in the installation of various water filtrations systems. We measure transfer of control of the performance obligation on long-term contracts utilizing the cost-to-cost measure of progress, with cost of revenue including direct costs, such as labor and materials. Under the cost-to-cost approach, the use of estimated costs to complete each performance obligation is a significant variable in the process of determining recognized revenue and a significant factor in the accounting for such performance obligations. The timing of when we bill our customers is generally dependent upon advance billings terms, milestone billings based on completion of certain phases of the work or when services are provided, or products are shipped. Projects with performance obligations recognized over time that have costs and estimated earnings recognized to date in excess of cumulative billings are reported on our Balance Sheets as contract assets. Projects with performance obligations recognized over time that have cumulative billings in excess of costs and estimated earnings recognized to date are reported on our Balance Sheets as contract liabilities. In Denmark, Value Added Tax (“VAT”) of 25% not
Advertising Costs, Policy [Policy Text Block]	Advertising Cost -- $38,951 $16,350, December 31, 2018 2017,
Research, Development, and Computer Software, Policy [Policy Text Block]	Research and Development Cost -- December 31, 2018 2017 $661,014, $536,848,
Income Tax, Policy [Policy Text Block]	Income Taxes -- 740
Earnings Per Share, Policy [Policy Text Block]	Loss Per Share -- 260 not
Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block]	Stock Options and Awards -- 11. 718, $56,434 $178,944
Fair Value Measurement, Policy [Policy Text Block]	Fair Value of Financial Instruments -- 820. three ● Level 1. ● Level 2. ● Level 3. no Unless otherwise disclosed, the fair value of the Company’s financial instruments including cash, accounts receivable, other receivables, prepaid expenses, investments, accounts payable, accrued expenses, capital lease obligations and notes payable approximates their recorded values due to their short-term maturities.
Use of Estimates, Policy [Policy Text Block]	Accounting Estimates --
New Accounting Pronouncements, Policy [Policy Text Block]	Recent Accounting Pronouncements -- February 25, 2016, 2016 02, December 15, 2018. 7. not In June 2018, No. 2018 07, 718 2018 07” 2018 07 718 Other recent accounting pronouncements issued by the FASB did not not

Note 1 - Summary of Significa_2

Note 1 - Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2018
Notes Tables
Allowance for Credit Losses on Financing Receivables [Table Text Block]	201 8 201 7 Allowance for doubtful accounts at the beginning of the period $ 660,581 $ 2,128,452 Bad debt expense 353,562 (102,189 ) Receivables written off during the periods - (1,678,856 ) Effect of currency translation (42,371 ) 313,174 Allowance for doubtful accounts at the end of the period $ 971,772 $ 660,581

Note 2 - Inventory (Tables)

Note 2 - Inventory (Tables)	12 Months Ended
	Dec. 31, 2018
Notes Tables
Schedule of Inventory, Current [Table Text Block]	201 8 201 7 Furnace parts and supplies $ 596,806 $ 400,589 Raw materials 1,659,826 1,260,209 Work in process 1,691,175 2,123,418 Finished goods and filtration systems 1,596,042 2,297,743 Reserve for obsolescence (1,111,794 ) (1,420,093 ) Net Inventory $ 4,432,055 $ 4,661,866

Note 3 - Property and Equipme_2

Note 3 - Property and Equipment (Tables)	12 Months Ended
	Dec. 31, 2018
Notes Tables
Property, Plant and Equipment [Table Text Block]	Useful Life 201 8 201 7 Production equipment 3 - 10 $ 9,614,189 $ 10,114,398 Lab equipment 3 - 10 82,930 87,094 Computer equipment 3 - 5 204,807 204,553 Vehicles 3 - 5 71,711 75,312 Furniture and fixture 5 111,417 106,047 Leasehold improvements 10 1,037,678 1,076,731 11,122,732 11,664,135 Less Accumulated Depreciation (9,691,083 ) (9,704,930 ) Net Property and Equipment $ 1,431,649 $ 1,959,205

Note 4 - Investments at Cost (T

Note 4 - Investments at Cost (Tables)	12 Months Ended
	Dec. 31, 2018
Notes Tables
Fair Value, by Balance Sheet Grouping [Table Text Block]	As of December 31, 2018 Level 1 Level 2 Level 3 Investments - - 5,714 Total - - 5,714 As of December 31, 2017 Level 1 Level 2 Level 3 Investments - - 6,001 Total - - 6,001

Note 5 - Definite-life Intang_2

Note 5 - Definite-life Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2018
Notes Tables
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	Year ending December 31, Amortization Expenses 2019 748 Thereafter - $ 748

Note 7 - Leases (Tables)

Note 7 - Leases (Tables)	12 Months Ended
	Dec. 31, 2018
Notes Tables
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]	Year ending December 31, Lease Payments 2019 712,250 2020 578,997 2021 402,584 2022 350,249 Thereafter 560,977 Total Minimum Lease Payments $ 2,605,057
Schedule of Future Minimum Lease Payments for Capital Leases [Table Text Block]	Year ending December 31, Lease Payments 2019 14,654 Thereafter - Total minimum lease payments 14,654 Less amount representing interest (865 ) Present value of minimum lease payments 13,789 Less Current Portion (13,789 ) $ -

Note 9 - Income Taxes (Tables)

Note 9 - Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2018
Notes Tables
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]	201 8 201 7 Vacation accrual $ 3,814 $ 2,900 Allowance for doubtful accounts 734 743 Reserve for obsolete inventory 241,624 305,425 Business tax credit carryover - 30,935 Deferred Compensation 24,451 16,787 Net operating loss carryover 5,184,992 4,646,434 Excess of book over tax depreciation (33,182 ) (71,116 ) Valuation allowance (5,422,432 ) (4,932,108 ) Long term deferred tax asset $ - $ -
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]	201 8 201 7 Computed tax at expected statutory rate $ (877,791 ) $ (1,624,575 ) State and local income taxes, net of federal benefit (9 ) (4,350 ) Non-US income taxed at different rates (15,535 ) 256,207 Effect of change in corporate tax rate 321,925 994,336 ) Non-deductible expenses 14,580 4,664 Valuation allowance 193,584 75,156 Other (2,184 ) (19,248 ) Income tax expense (benefit) $ (365,430 ) $ (317,810 )
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]	201 8 201 7 Current income tax expense: Danish $ (365,430 ) $ (317,810 ) Federal - - State - - Current tax (benefit) $ (365,430 ) $ (317,810 ) Book in excess of tax depreciation $ (40,231 ) $ (225,111 ) Allowance for doubful accounts - 459 Net operating loss carryover (729,928 ) 260,540 Valuation allowance 704,876 75,156 Deferred compensation 13,127 (8,287 ) Accrued vacation (949 ) 2,550 Reserve for obsolete inventory 53,105 (105,307 ) Deferred tax expense (benefit) $ - $ - Total tax expense (benefit) $ (365,430 ) $ (317,810 )

Note 10 - Earnings Per Share (T

Note 10 - Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2018
Notes Tables
Schedule of Weighted Average Number of Shares [Table Text Block]	For the Year Ended December 31 201 8 201 7 Net Loss attributable to LiqTech International Inc. $ (3,814,528 ) $ (4,460,353 ) Weighted average number of common shares used in basic earnings per share 63,843,634 41,595,856 Effect of dilutive securities, stock options and warrants - - Weighted average number of common shares and potential dilutive common shares outstanding used in dilutive earnings per share 63,843,634 41,595,856

Note 11 - Stockholders' Equity

Note 11 - Stockholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2018
Notes Tables
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]	Warrants Outstanding Warrants Exercisable Exercise Prices Number Weighted Weighted Exercise Number Weighted $ 1.65 400,000 0.57 $ 1.65 400,000 $ 1.65 Total 400,000 0.57 $ 1.65 400,000 $ 1.65
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]	Options Outstanding Options Exercisable Exercise Number Weighted Life (years) Weighted Number Weighted $ 0.74 280,000 1.62 $ 0.74 280,000 $ 0.74 Total 280,000 1.62 $ 0.74 280,000 $ 0.74
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding and Exercisable [Table Text Block]	December 31, 201 8 Shares Weighted Average Weighted Outstanding at beginning of period 455,000 $ 0.82 5.15 $ - Granted - - - - Exercised (175,000 ) - - - Forfeited - - - - Expired - - - - Outstanding at end of period 280,000 $ 0.34 1.62 $ - Vested and expected to vest 280,000 $ 0.34 1.62 $ - Exercisable end of period 280,000 $ 0.34 1.62 $ -

Note 12 - Significant Custome_2

Note 12 - Significant Customers / Concentration (Tables)	12 Months Ended
	Dec. 31, 2018
Notes Tables
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]	For the Year Ended December 31 2018 2017 United States and Canada $ 922,245 $ 1,115,447 Australia 597,214 640,322 South America 49,861 89,438 Asia 1,369,735 1,608,822 Europe 9,293,033 7,889,148 $ 12,232,088 $ 11,343,177
Reconciliation of Revenue from Segments to Consolidated [Table Text Block]	For the Year Ended December 31 2018 2017 Ceramic diesel particulate $ 6,536,085 $ 7,230,416 Liquid filters and systems 5,264,663 3,529,360 Development projects 431,340 458,064 Kiln furniture - 125,337 $ 12,232,088 $ 11,343,177

Schedule II - Valuation and Q_2

Schedule II - Valuation and Qualifying Accounts (Tables)	12 Months Ended
	Dec. 31, 2018
Notes Tables
Valuation Allowances and Reserves, Bad Debt Expense and Reserve for Obsolete Inventory [Table Text Block]	201 8 201 7 Bad debt expense 353,562 (102,189 ) Reserve for obsolete inventory 251,920 (206,155 )
Valuation Allowances and Reserves [Table Text Block]	Balance Beginning of Year Charges to Costs and Expenses Deductions (1) Balance End of Year Year Ended December 31, 2018 Allowance for inventory obsolescence $ 1,409,074 $ 251,920 $ (549,199 ) $ 1,111,795 Allowance for doubtful accounts 660,581 353,562 (42,371 ) 971,772 Totals $ 2,069,655 $ 605,482 $ (591,570 ) $ 2,083,567 Year Ended December 31, 2017 Allowance for inventory obsolescence $ 1,421,345 $ (206,155 ) $ 193,884 $ 1,409,074 Allowance for doubtful accounts 2,128,452 (102,189 ) (1,365,682 ) 660,581 Totals $ 3,549,797 $ (308,344 ) $ (1,171,798 ) $ 2,069,655
Allowance for Credit Losses on Financing Receivables [Table Text Block]	201 8 201 7 Allowance for doubtful accounts at the beginning of the period $ 660,581 $ 2,128,452 Bad debt expense 353,562 (102,189 ) Receivables written off during the periods - (1,678,856 ) Effect of currency translation (42,371 ) 313,174 Allowance for doubtful accounts at the end of the period $ 971,772 $ 660,581

Note 1 - Summary of Significa_3

Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Cash, Uninsured Amount	$ 0	$ 0
Value Added Tax Of Invoice, Percentage	25.00%
Advertising Expense	$ 38,951	16,350
Research and Development Expense, Total	661,014	536,848
Allocated Share-based Compensation Expense, Total	$ 56,434	$ 178,944
Minimum [Member]
Property, Plant and Equipment, Useful Life	3 years
Maximum [Member]
Property, Plant and Equipment, Useful Life	10 years
LiqTech USA [Member] | LiqTech International DK [Member]
Percentage of Subsidiary Owned	100.00%
LiqTech USA [Member] | LiqTech NA [Member]
Percentage of Subsidiary Owned	100.00%
LiqTech International DK [Member] | LiqTech Germany [Member]
Percentage of Subsidiary Owned	100.00%
LiqTech International DK [Member] | LiqTech PTE [Member]
Percentage of Subsidiary Owned	95.00%

Note 1 - Summary of Significa_4

Note 1 - Summary of Significant Accounting Policies - Allowance for Doubtful Accounts (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Allowance for doubtful accounts at the beginning of the period	$ 660,581	$ 2,128,452
Bad debt expense	353,562	(102,189)
Receivables written off during the periods		(1,678,856)
Effect of currency translation	(42,371)	313,174
Allowance for doubtful accounts at the end of the period	$ 971,772	$ 660,581

Note 2 - Inventory (Details Tex

Note 2 - Inventory (Details Textual)	Dec. 31, 2018USD ($)
Inventory Pledged as Collateral	$ 4,011,203

Note 2 - Inventory - Summary of

Note 2 - Inventory - Summary of Inventory (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Furnace parts and supplies	$ 596,806	$ 400,589
Raw materials	1,659,826	1,260,209
Work in process	1,691,175	2,123,418
Finished goods and filtration systems	1,596,042	2,297,743
Reserve for obsolescence	(1,111,794)	(1,420,093)
Net Inventory	$ 4,432,055	$ 4,661,866

Note 3 - Property and Equipme_3

Note 3 - Property and Equipment (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Depreciation, Total	$ 819,070	$ 937,235

Note 3 - Property and Equipme_4

Note 3 - Property and Equipment - Summary of Property and Equipment (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Property and equipment, gross	$ 11,122,732	$ 11,664,135
Less Accumulated Depreciation	(9,691,083)	(9,704,930)
Net Property and Equipment	1,431,649	1,959,205
Production Equipment [Member]
Property and equipment, gross	9,614,189	10,114,398
Lab Equipment [Member]
Property and equipment, gross	82,930	87,094
Computer Equipment [Member]
Property and equipment, gross	204,807	204,553
Vehicles [Member]
Property and equipment, gross	$ 71,711	75,312
Furniture and Fixtures [Member]
Useful Life (Year)	5 years
Property and equipment, gross	$ 111,417	106,047
Leasehold Improvements [Member]
Useful Life (Year)	10 years
Property and equipment, gross	$ 1,037,678	$ 1,076,731
Minimum [Member]
Useful Life (Year)	3 years
Minimum [Member] | Production Equipment [Member]
Useful Life (Year)	3 years
Minimum [Member] | Lab Equipment [Member]
Useful Life (Year)	3 years
Minimum [Member] | Computer Equipment [Member]
Useful Life (Year)	3 years
Minimum [Member] | Vehicles [Member]
Useful Life (Year)	3 years
Maximum [Member]
Useful Life (Year)	10 years
Maximum [Member] | Production Equipment [Member]
Useful Life (Year)	10 years
Maximum [Member] | Lab Equipment [Member]
Useful Life (Year)	10 years
Maximum [Member] | Computer Equipment [Member]
Useful Life (Year)	5 years
Maximum [Member] | Vehicles [Member]
Useful Life (Year)	5 years

Note 4 - Investments at Cost (D

Note 4 - Investments at Cost (Details Textual)	Dec. 31, 2018USD ($)	Dec. 31, 2018EUR (€)	Dec. 31, 2017USD ($)	Dec. 31, 2017EUR (€)
Other Long-term Investments | $	$ 5,714		$ 6,001
LEA Technology [Member]
Other Long-term Investments | €		€ 5,000		€ 5,000

Note 4 - Investments at Cost -

Note 4 - Investments at Cost - Financial Assets and Liabilities (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Inputs, Level 1 [Member]
Investments
Total
Fair Value, Inputs, Level 2 [Member]
Investments
Total
Fair Value, Inputs, Level 3 [Member]
Investments	5,714	6,001
Total	$ 5,714	$ 6,001

Note 5 - Definite-life Intang_3

Note 5 - Definite-life Intangible Assets (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Intangible Assets, Net (Excluding Goodwill), Total	$ 748	$ 3,349
Patents [Member]
Amortization of Intangible Assets, Total	$ 2,519	$ 2,265
Patents [Member] | Maximum [Member]
Finite-Lived Intangible Asset, Useful Life	10 years

Note 5 - Definite-life Intang_4

Note 5 - Definite-life Intangible Assets - Expected Future Amortization Expense (Details)	Dec. 31, 2018USD ($)
2019	$ 748
Thereafter
	$ 748

Note 6 - Lines of Credit (Detai

Note 6 - Lines of Credit (Details Textual) - Dec. 31, 2018	USD ($)	DKK (kr)
Line of Credit Facility, Maximum Borrowing Capacity	$ 14,514	kr 94,620
Guarantor Obligations, Current Carrying Value	$ 14,514	kr 94,620

Note 7 - Leases (Details Textua

Note 7 - Leases (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Operating Leases, Rent Expense, Total	$ 642,546	$ 651,032
Capital Leased Assets, Gross, Total	1,182,778	1,328,672
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation	1,169,272	1,301,870
Depreciation, Total	819,070	937,235
Interest Expense, Lessee, Assets under Capital Lease	5,021	6,290
Assets Held under Capital Leases [Member]
Depreciation, Total	11,180	$ 39,623
Capital Lease Obligations [Member]
Debt Instrument, Periodic Payment, Total	$ 2,093

Note 7 - Leases - Future Minimu

Note 7 - Leases - Future Minimum Lease Payments for Non-cancelable Operating Leases (Details)	Dec. 31, 2018USD ($)
2019	$ 712,250
2020	578,997
2021	402,584
2022	350,249
Thereafter	560,977
Total Minimum Lease Payments	$ 2,605,057

Note 7 - Leases - Future Mini_2

Note 7 - Leases - Future Minimum Capital Lease Payments (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
2019	$ 14,654
Thereafter
Total minimum lease payments	14,654
Less amount representing interest	(865)
Present value of minimum lease payments	13,789
Less Current Portion	$ (13,789)	$ (26,186)

Note 8 - Agreements, Commitme_2

Note 8 - Agreements, Commitments and Contingencies (Details Textual)	Feb. 27, 2019USD ($)	Feb. 27, 2019DKK (kr)	Nov. 20, 2018USD ($)	Nov. 20, 2018DKK (kr)	Dec. 20, 2017USD ($)	Sep. 09, 2014EUR (€)	Dec. 31, 2018USD ($)	Dec. 31, 2018EUR (€)	Dec. 31, 2017USD ($)	Dec. 31, 2018DKK (kr)
Defined Contribution Plan, Cost | $							$ 11,691		$ 11,347
Line of Credit Facility, Maximum Borrowing Capacity							14,514			kr 94,620
Guarantor Obligations, Current Carrying Value							$ 14,514			kr 94,620
Customer Dispute, Installation of Water Treatment Systems [Member]
Loss Contingency, Damages Sought, Value | $					$ 1,098,678
Litigation Settlement, Amount Awarded from Other Party | €								€ 380,000
LiqTech International AS [Member] | Claim with Former Supplier for Breach of Agreement [Member]
Loss Contingency, Damages Sought, Value			$ 68,800	kr 448,500
LiqTech International AS [Member] | Claim with Former Supplier for Services Rendered [Member] | Subsequent Event [Member]
Loss Contingency, Damages Sought, Value	$ 83,400	kr 543,905
LiqTech Italy [Member] | Chief Executive Officer [Member]
Loss Contingency, Damages Sought, Value | €						€ 750,000
Equity Method Investment, Ownership Percentage						60.00%
LiqTech Italy [Member] | Chief Executive Officer [Member] | Venture [Member]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners						40.00%

Note 9 - Income Taxes (Details

Note 9 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
LiqTech International Inc and LiqTech NA [Member]
Deferred Tax Assets, Valuation Allowance, Total	$ 3,293,000	$ 2,833,000
LiqTech International AS and LiqTech Systems AS [Member]
Deferred Tax Assets, Valuation Allowance, Total	1,892,000	1,850,000
LiqTech Germany [Member]
Deferred Tax Assets, Valuation Allowance, Total	132,000	139,000
LiqTech Singapore [Member]
Deferred Tax Assets, Valuation Allowance, Total	105,000	110,000
Internal Revenue Service (IRS) [Member] | Domestic Tax Authority [Member]
Deferred Tax Assets, Operating Loss Carryforwards, Domestic	15,749,964
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	(460,000)	(709,000)
Danish Ministry of Taxation [Member] | Domestic Tax Authority [Member]
Deferred Tax Assets, Operating Loss Carryforwards, Domestic	7,454,447
Danish Ministry of Taxation [Member] | Foreign Tax Authority [Member]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	(42,000)	755,000
Federal Ministry of Finance, Germany [Member] | Foreign Tax Authority [Member]
Deferred Tax Assets, Operating Loss Carryforwards, Foreign	475,161
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	(7,000)	17,000
Inland Revenue, Singapore (IRAS) [Member] | Foreign Tax Authority [Member]
Deferred Tax Assets, Operating Loss Carryforwards, Foreign	617,359
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ (5,000)	$ 13,000

Note 9 - Income Taxes - Deferre

Note 9 - Income Taxes - Deferred Tax Assets (Liabilities) (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Vacation accrual	$ 3,814	$ 2,900
Allowance for doubtful accounts	734	743
Reserve for obsolete inventory	241,624	305,425
Business tax credit carryover		30,935
Deferred Compensation	24,451	16,787
Net operating loss carryover	5,184,992	4,646,434
Excess of book over tax depreciation	(33,182)	(71,116)
Valuation allowance	(5,422,432)	(4,932,108)
Long term deferred tax asset

Note 9 - Income Taxes - Reconci

Note 9 - Income Taxes - Reconciliation of Income Tax Expense (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Computed tax at expected statutory rate	$ (877,791)	$ (1,624,575)
State and local income taxes, net of federal benefit	(9)	(4,350)
Non-US income taxed at different rates	(15,535)	256,207
Effect of change in corporate tax rate	321,925	994,336
Non-deductible expenses	14,580	4,664
Valuation allowance	193,584	75,156
Other	(2,184)	(19,248)
Total tax expense (benefit)	$ (365,430)	$ (317,810)

Note 9 - Income Taxes - Compone

Note 9 - Income Taxes - Components of Income Tax Expense (Benefit) from Continuing Operations (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Current income tax expense:
Federal
State
Current tax (benefit)	(365,430)	(317,810)
Book in excess of tax depreciation	(40,231)	(225,111)
Allowance for doubful accounts		459
Net operating loss carryover	(729,928)	260,540
Valuation allowance	704,876	75,156
Deferred compensation	13,127	(8,287)
Accrued vacation	(949)	2,550
Reserve for obsolete inventory	53,105	(105,307)
Deferred tax expense (benefit)
Total tax expense (benefit)	(365,430)	(317,810)
Danish Ministry of Taxation [Member]
Current income tax expense:
Danish	$ (365,430)	$ (317,810)

Note 10 - Earnings Per Share (D

Note 10 - Earnings Per Share (Details Textual) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance	$ 0.34	$ 0.82
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 1.65	$ 1.65
Preferred Stock, Shares Issued, Total	0	2,200,837
Convertible Preferred Stock, Aggregate Shares Issued upon Conversion		8,803,348
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance	$ 0.74	$ 0.74
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance		$ 1.01
Employee Stock Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	280,000	455,000
Warrant [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	400,000	400,000
Mandatory Convertible Preferred Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		2,200,837

Note 10 - Earnings Per Share -

Note 10 - Earnings Per Share - Amounts Used in Computing Earnings Per Share (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Net Loss attributable to LiqTech International Inc.	$ (3,814,528)	$ (4,460,353)
Weighted average number of common shares used in basic earnings per share (in shares)	63,843,634	41,595,856
Effect of dilutive securities, stock options and warrants (in shares)	0
Weighted average number of common shares and potential dilutive common shares outstanding used in dilutive earnings per share (in shares)	63,843,634	41,595,856

Note 11 - Stockholders' Equit_2

Note 11 - Stockholders' Equity (Details Textual) - USD ($)	Nov. 27, 2018	Oct. 16, 2018	Sep. 19, 2018	Apr. 16, 2018	Jan. 02, 2018	Nov. 22, 2017	Dec. 31, 2018	Dec. 31, 2017
Common Stock, Shares Authorized							100,000,000	100,000,000
Common Stock, Par or Stated Value Per Share							$ 0.001	$ 0.001
Common Stock, Shares, Issued, Total							72,915,547	44,229,264
Preferred Stock, Shares Authorized							10,000,000	10,000,000
Preferred Stock, Shares Outstanding, Ending Balance							0	2,200,837
Stock Issued During Period, Shares, New Issues				19,448,529
Share Price				$ 0.34
Proceeds from Issuance of Common Stock				$ 5,865,077			$ 6,777,100	$ 1,825,000
Convertible Preferred Stock, Aggregate Shares Issued upon Conversion								8,803,348
Payments of Stock Issuance Costs							747,423	$ 192,736
Allocated Share-based Compensation Expense, Total							$ 56,434	$ 178,944
Class of Warrant or Right, Outstanding, Non-vested Warrants							0	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance							280,000	455,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares, Ending Balance							0
Common Stock, Shares, Outstanding, Ending Balance							72,915,547	44,229,264
The 2011 Stock Options Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance							280,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options							$ 0
The 2015 Stock Option Plan [Member]
Stock Issued During Period, Shares, New Issues	45,000	130,000	45,000
Share Price	$ 0.74	$ 1.01	$ 0.74
Proceeds from Issuance of Common Stock	$ 33,300	$ 131,300	$ 33,300
Warrants [Member]
Allocated Share-based Compensation Expense, Total							0	$ 17,634
Employee Stock Option [Member] | The 2011 Stock Options Plan [Member]
Allocated Share-based Compensation Expense, Total							15,767	70,477
Director [Member]
Stock Issued During Period, Shares, Restricted Stock Award, Gross					59,406
Stock Issued During Period, Value, Restricted Stock Award, Gross					$ 60,000
Director [Member] | Restricted Stock [Member]
Allocated Share-based Compensation Expense, Total							$ 100,667	$ 90,833
Convertible Preferred Stock [Member]
Preferred Stock, Shares Outstanding, Ending Balance							0	2,200,837
Convertible Preferred Stock, Aggregate Shares Issued upon Conversion						8,803,348
Convertible Preferred Stock [Member] | Private Placement [Member]
Stock Issued During Period, Shares, New Issues						2,200,837
Convertible Preferred Stock, Shares Issued upon Conversion						4
Shares Issued, Price Per Share						$ 1.20
Proceeds from Issuance of Private Placement						$ 2,641,004
Payments of Stock Issuance Costs						$ 127,736

Note 11 - Stockholders' Equit_3

Note 11 - Stockholders' Equity - Warrants Outstanding by Exercise Price (Details) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Exercise prices of warrants (in dollars per share)	$ 1.65	$ 1.65
Warrants outstanding (in shares)	400,000
Warrants outstanding, weighted average remaining contractual life (Year)	208 days
Warrants outstanding, weighted average exercise price (in dollars per share)	$ 1.65
Warrants exercisable (in shares)	400,000
Warrants exercisable, weighted average exercise price (in dollars per share)	$ 1.65
Warrant 1 [Member]
Exercise prices of warrants (in dollars per share)	$ 1.65
Warrants outstanding (in shares)	400,000
Warrants outstanding, weighted average remaining contractual life (Year)	208 days
Warrants outstanding, weighted average exercise price (in dollars per share)	$ 1.65
Warrants exercisable (in shares)	400,000
Warrants exercisable, weighted average exercise price (in dollars per share)	$ 1.65

Note 11 - Stockholders' Equit_4

Note 11 - Stockholders' Equity - Options Outstanding by Exercise Price (Details)	12 Months Ended
	Dec. 31, 2018$ / sharesshares
Options outstanding (in shares) | shares	280,000
Options outstanding, weighted average remaining contractual life (Year)	1 year 226 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 0.74
Options exercisable (in shares) | shares	280,000
Options exercisable, weighted average exercise price (in dollars per share)	$ 0.74
Price Range 1 [Member]
Exercise prices of options (in dollars per share)	$ 0.74
Options outstanding (in shares) | shares	280,000
Options outstanding, weighted average remaining contractual life (Year)	1 year 226 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 0.74
Options exercisable (in shares) | shares	280,000
Options exercisable, weighted average exercise price (in dollars per share)	$ 0.74

Note 11 - Stockholders' Equit_5

Note 11 - Stockholders' Equity - Status of Options and Changes During the Year (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Outstanding, shares (in shares)	455,000
Outstanding, weighted average exercise price (in dollars per share)	$ 0.34	$ 0.82
Outstanding, average remaining life (Year)	1 year 226 days	5 years 54 days
Granted, shares (in shares)
Granted, weighted average exercise price (in dollars per share)
Exercised, shares (in shares)	(175,000)
Exercised, weighted average exercise price (in dollars per share)
Forfeited, shares (in shares)
Forfeited, weighted average exercise price (in dollars per share)
Expired, shares (in shares)
Expired, weighted average exercise price (in dollars per share)
Outstanding, shares (in shares)	280,000	455,000
Outstanding, weighted average intrinsic value
Vested and expected to vest, shares (in shares)	280,000
Vested and expected to vest, weighted average exercise price (in dollars per share)	$ 0.34
Vested and expected to vest, average remaining life (Year)	1 year 226 days
Vested and expected to vest, weighted average intrinsic value
Exercisable end of period, shares (in shares)	280,000
Exercisable end of period, weighted average exercise price (in dollars per share)	$ 0.34
Exercisable end of period, average remaining life (Year)	1 year 226 days
Exercisable end of period, weighted average intrinsic value

Note 12 - Significant Custome_3

Note 12 - Significant Customers / Concentration (Details Textual)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Customer Concentration Risk [Member] | Sales Revenue, Net [Member]
Number of Major Customers	4	4
Concentration Risk, Percentage	31.00%	38.00%
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Major Customer 1 [Member]
Concentration Risk, Percentage	10.00%	16.00%
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Major Customer 2 [Member]
Concentration Risk, Percentage	9.00%	10.00%
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Major Customer 3 [Member]
Concentration Risk, Percentage	6.00%	7.00%
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Major Customer 4 [Member]
Concentration Risk, Percentage	5.00%	5.00%
Geographic Concentration Risk [Member] | Assets, Total [Member] | DENMARK
Concentration Risk, Percentage	91.00%	87.00%
Geographic Concentration Risk [Member] | Assets, Total [Member] | UNITED STATES
Concentration Risk, Percentage	9.00%	13.00%

Note 12 - Significant Custome_4

Note 12 - Significant Customers / Concentration - Net Sales by Geographical Region (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Net Sales	$ 12,232,088	$ 11,343,177
Reportable Geographical Components [Member] | US And Canada [Member]
Net Sales	922,245	1,115,447
Reportable Geographical Components [Member] | AUSTRALIA
Net Sales	597,214	640,322
Reportable Geographical Components [Member] | South America [Member]
Net Sales	49,861	89,438
Reportable Geographical Components [Member] | Asia [Member]
Net Sales	1,369,735	1,608,822
Reportable Geographical Components [Member] | Europe [Member]
Net Sales	$ 9,293,033	$ 7,889,148

Note 12 - Significant Custome_5

Note 12 - Significant Customers / Concentration - Sales by Product Line (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Net Sales	$ 12,232,088	$ 11,343,177
Ceramic Diesel Particulate [Member]
Net Sales	6,536,085	7,230,416
Liquid Filters [Member]
Net Sales	5,264,663	3,529,360
Development Projects [Member]
Net Sales	431,340	458,064
Kiln Furniture [Member]
Net Sales		$ 125,337

Note 13 - Subsequent Event (Det

Note 13 - Subsequent Event (Details Textual) - USD ($)	Feb. 25, 2019	Jan. 02, 2018	Feb. 14, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period				175,000
Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period			180,000
Shares Issued, Price Per Share			$ 0.74
Proceeds from Stock Options Exercised			$ 133,200
Director [Member]
Stock Issued During Period, Shares, Restricted Stock Award, Gross		59,406
Stock Issued During Period, Value, Restricted Stock Award, Gross		$ 60,000
Director [Member] | Subsequent Event [Member]
Stock Issued During Period, Shares, Restricted Stock Award, Gross	146,405
Stock Issued During Period, Value, Restricted Stock Award, Gross	$ 82,595
Chief Executive Officer [Member] | Subsequent Event [Member]
Stock Issued During Period, Shares, Restricted Stock Award, Gross	36,232
Stock Issued During Period, Value, Restricted Stock Award, Gross	$ 75,000

Schedule II - Valuation and Q_3

Schedule II - Valuation and Qualifying Accounts - Bad Debt Expense and Reserves for Obsolete Inventory (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Bad debt expense	$ 353,562	$ (102,189)
Reserve for obsolete inventory	$ 207,384	$ (206,155)

Schedule II - Valuation and Q_4

Schedule II - Valuation and Qualifying Accounts - Valuation and Qualifying Accounts (Details) - USD ($)		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Balance Beginning of Year		$ 2,069,655	$ 3,549,797
Charges to Costs and Expenses		605,482	(308,344)
Deductions	[1]	(591,570)	(1,171,798)
Balance End of Year		2,083,567	2,069,655
SEC Schedule, 12-09, Reserve, Inventory [Member]
Balance Beginning of Year		1,409,074	1,421,345
Charges to Costs and Expenses		251,920	(206,155)
Deductions	[1]	(549,199)	193,884
Balance End of Year		1,111,795	1,409,074
SEC Schedule, 12-09, Allowance, Credit Loss [Member]
Balance Beginning of Year		660,581	2,128,452
Charges to Costs and Expenses		353,562	(102,189)
Deductions	[1]	(42,371)	(1,365,682)
Balance End of Year		$ 971,772	$ 660,581
[1]	Includes write-offs, the impact of foreign currency exchange rates.

Schedule II - Valuation and Q_5

Schedule II - Valuation and Qualifying Accounts - Rollforward for Allowance for Doubtful Accounts (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Allowance for doubtful accounts at the beginning of the period	$ 660,581	$ 2,128,452
Bad debt expense	353,562	(102,189)
Receivables written off during the periods		(1,678,856)
Effect of currency translation	(42,371)	313,174
Allowance for doubtful accounts at the end of the period	$ 971,772	$ 660,581