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Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($)
$ in Thousands
Common Stock [Member]
Common Stock Class A [Member]
Common Stock [Member]
Common Stock Class B [Member]
Additional Paid-In Capital [Member]
Accumulated Surplus (Deficit) [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Noncontrolling Interest [Member]
Total
Beginning balance at Dec. 31, 2019 $ 2 $ 0 $ 83,487 $ 15,507 $ (1,675)   $ 97,321
Beginning balance (in shares) at Dec. 31, 2019 16,182,151 1,862,608          
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income $ 0 $ 0 0 1,705 0   1,705
Foreign currency translation adjustment 0 0 0 0 (948)   (948)
Exercise of stock options $ 0 $ 0 175 0 0   175
Exercise of stock options (in shares) 70,478 0          
Stock-based compensation $ 0 $ 0 689 0 0   689
Exercise of stock warrant $ 0 $ 0 0 0 0   0
Exercise of stock warrant (in shares) 64,717 0          
Ending balance at Mar. 31, 2020 $ 2 $ 0 84,351 17,212 (2,623)   98,942
Ending balance (in shares) at Mar. 31, 2020 16,317,346 1,862,608          
Beginning balance at Dec. 31, 2020 $ 2 $ 0 102,004 34,287 4,857 $ 67,020 208,170
Beginning balance (in shares) at Dec. 31, 2020 16,896,693 1,802,606          
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income             5,470
Net income $ 0 $ 0 0 5,470 0 352 5,822
Foreign currency translation adjustment 0 0 0 0 (896) (436) (1,332)
Exercise of stock options $ 0 $ 0 1,377 0 0 0 1,377
Exercise of stock options (in shares) 309,940 0          
Stock-based compensation $ 0 $ 0 1,210 0 0 0 1,210
Conversion of class B common stock to Class A common stock $ 0 $ 0 0 0 0 0 0
Conversion of class B common stock to Class A common stock (in shares) 33,334 (33,334)          
Ending balance at Mar. 31, 2021 $ 2 $ 0 $ 104,591 $ 39,757 $ 3,961 $ 66,936 $ 215,247
Ending balance (in shares) at Mar. 31, 2021 17,239,967 1,769,272