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Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Common Stock [Member]
Additional Paid-in Capital [Member]
AOCI Attributable to Parent [Member]
Retained Earnings [Member]
Total
Balance (in shares) at Dec. 31, 2017 8,777,988        
Balance at Dec. 31, 2017 $ 88 $ 14,877 $ (143) $ 4,631 $ 19,453
Stock options exercised (in shares) 40,000       40,000
Stock options exercised 111 $ 111
Net income 6,244 6,244
Stock compensation expense 62 62
Foreign currency translation adjustment 28 28
Unrealized loss on marketable securities 23 23
Balance (in shares) at Dec. 31, 2018 8,817,988        
Balance at Dec. 31, 2018 $ 88 15,050 (92) 10,875 $ 25,921
Stock options exercised (in shares) 107,000       107,000
Stock options exercised $ 1 209 $ 210
Net income 10,969 10,969
Stock compensation expense 191 191
Foreign currency translation adjustment (2) (2)
Unrealized loss on marketable securities        
Balance (in shares) at Dec. 31, 2019 8,924,988        
Balance at Dec. 31, 2019 $ 89 $ 15,450 $ (94) $ 21,844 $ 37,289