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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]
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]
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]
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 $ 14 $ 59,986                                      
Stock based compensation expenses recognized                                     18,273  
Currency translation, net                                     174,867  
Net Gain (Loss) attributable to LiqTech International, Inc.                                     (1,533,287)  
Currency Translation                                     174,867  
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)  
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)  
Currency translation, net                                                 $ (458,560)
Net Gain (Loss) attributable to LiqTech International, Inc.                                                 (1,796,815)
Currency Translation                                                 (458,560)
BALANCE (in shares) at Jun. 30, 2018                                     18,185,137          
BALANCE at Jun. 30, 2018                                     $ 18,185 46,411,430 (30,268,509) (5,499,352) (52,499)  
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)  
Stock based compensation expenses recognized                                     9,161  
Currency translation, net                                     (633,427) (633,427)
Net Gain (Loss) attributable to LiqTech International, Inc.                                     (263,526) (263,526)
Common shares issued, net offering cost (in shares)                                     4,862,132          
Common shares issued, net offering cost                                     $ 4,862 5,860,215  
Conversion of mandatory preferred stock issued (in shares)                         (2,200,837) 2,200,837                      
Conversion of mandatory preferred stock issued                         $ (2,201) $ 2,201              
Currency Translation                                     (633,427) (633,427)
BALANCE (in shares) at Jun. 30, 2018                                     18,185,137          
BALANCE at Jun. 30, 2018                                     $ 18,185 46,411,430 (30,268,509) (5,499,352) (52,499)  
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)  
Net Gain (Loss) attributable to LiqTech International, Inc.                                     34,244  
Currency Translation                                     (213,922)  
Exercise of stock options (in shares)                                     45,000          
Exercise of stock options                                     $ 45 133,155  
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)  
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)  
Currency translation, net                                                 167,295
Net Gain (Loss) attributable to LiqTech International, Inc.                                                 181,030
Currency Translation                                                 $ 167,295
Exercise of stock options (in shares)                                                 45,000
BALANCE (in shares) at Jun. 30, 2019                                     20,547,668          
BALANCE at Jun. 30, 2019                                     $ 20,548 61,538,883 (32,105,194) (5,577,561) (29,166)  
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)  
Stock based compensation expenses recognized                                     17,333 5,834  
Currency translation, net                                     381,217 $ 381,217
Net Gain (Loss) attributable to LiqTech International, Inc.                                     146,786 146,786
Common shares issued, net offering cost (in shares)                                     2,215,862          
Common shares issued, net offering cost                                     $ 2,216 14,672,522  
Currency Translation                                     381,217 $ 381,217
Exercise of warrants (in shares)                                     28,887          
Exercise of warrants                                     $ 29 29  
Exercise of warrants                                     $ (29) (29)  
BALANCE (in shares) at Jun. 30, 2019                                     20,547,668          
BALANCE at Jun. 30, 2019                                     $ 20,548 $ 61,538,883 $ (32,105,194) $ (5,577,561) $ (29,166)