Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - USD ($)	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]	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, 2017							2,200,837	11,107,316
BALANCE at Dec. 31, 2017							$ 2,201	$ 11,108	$ 40,491,229	$ (28,471,696)	$ (5,040,792)	$ (79,933)
Common shares issued for services (in shares)		14,852
Common shares issued, for services provided		$ 15	$ 59,985
Stock based compensation expenses recognized												18,273
Currency translation, net											174,867		$ 174,867
Net Gain (Loss) attributable to LiqTech International Inc.										(1,533,287)			(1,533,289)
BALANCE (in shares) at Mar. 31, 2018							2,200,837	11,122,168
BALANCE at Mar. 31, 2018							$ 2,201	$ 11,123	40,551,214	(30,004,983)	(4,865,925)	(61,660)
Currency Translation, Net of Taxes											174,867		174,867
BALANCE (in shares) at Dec. 31, 2018								18,228,887
BALANCE at Dec. 31, 2018								$ 18,229	46,575,986	(32,286,224)	(5,744,856)	(23,499)
Common shares issued for services (in shares)		28,993
Common shares issued, for services provided		$ 29	$ 134,138			$ (21,667)
Stock based compensation expenses recognized									5,778			10,166
Currency translation, net											(213,922)		(213,922)
Net Gain (Loss) attributable to LiqTech International Inc.										34,244			$ 34,244
BALANCE (in shares) at Mar. 31, 2019								18,302,880
BALANCE at Mar. 31, 2019								$ 18,303	46,849,057	(32,251,980)	(5,958,778)	(35,000)
Exercising of stock options (in shares)								45,000					45,000
Exercising of stock options								$ 45	133,155
Currency Translation, Net of Taxes											$ (213,922)		$ (213,922)