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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
Net income 893 893
Stock compensation expense 13 13
Foreign currency translation adjustment 1 1
Unrealized gain (loss) on marketable securities (17) (17)
Balance (in shares) at Mar. 31, 2018 8,777,988        
Balance at Mar. 31, 2018 $ 88 14,890 (159) 5,524 20,343
Balance (in shares) at Dec. 31, 2017 8,777,988        
Balance at Dec. 31, 2017 $ 88 14,877 (143) 4,631 19,453
Net income         3,817
Unrealized gain (loss) on marketable securities         (23)
Balance (in shares) at Sep. 30, 2018 8,797,988        
Balance at Sep. 30, 2018 $ 88 14,955 (162) 8,448 23,329
Balance (in shares) at Mar. 31, 2018 8,777,988        
Balance at Mar. 31, 2018 $ 88 14,890 (159) 5,524 20,343
Net income 1,058 1,058
Stock compensation expense 13 13
Foreign currency translation adjustment 14 14
Unrealized gain (loss) on marketable securities 5 5
Stock options exercised (in shares) 20,000        
Stock options exercised 34 34
Balance (in shares) at Jun. 30, 2018 8,797,988        
Balance at Jun. 30, 2018 $ 88 14,937 (140) 6,582 21,467
Net income 1,866 1,866
Stock compensation expense 18 18
Foreign currency translation adjustment (11) (11)
Unrealized gain (loss) on marketable securities (11) (11)
Balance (in shares) at Sep. 30, 2018 8,797,988        
Balance at Sep. 30, 2018 $ 88 14,955 (162) 8,448 23,329
Balance (in shares) at Dec. 31, 2018 8,817,988        
Balance at Dec. 31, 2018 $ 88 15,050 (92) 10,875 25,921
Net income 2,072 2,072
Stock compensation expense 25 25
Foreign currency translation adjustment (1) (1)
Stock options exercised (in shares) 33,000        
Stock options exercised $ 1 58 59
Balance (in shares) at Mar. 31, 2019 8,850,988        
Balance at Mar. 31, 2019 $ 89 15,133 (93) 12,947 28,076
Balance (in shares) at Dec. 31, 2018 8,817,988        
Balance at Dec. 31, 2018 $ 88 15,050 (92) 10,875 25,921
Net income         7,272
Unrealized gain (loss) on marketable securities        
Stock options exercised (in shares)         80,000
Balance (in shares) at Sep. 30, 2019 8,897,988        
Balance at Sep. 30, 2019 $ 89 15,341 (124) 18,147 $ 33,453
Balance (in shares) at Mar. 31, 2019 8,850,988        
Balance at Mar. 31, 2019 $ 89 15,133 (93) 12,947 28,076
Net income 2,108 2,108
Stock compensation expense 55 55
Foreign currency translation adjustment (35) (35)
Balance (in shares) at Jun. 30, 2019 8,850,988        
Balance at Jun. 30, 2019 $ 89 15,188 (128) 15,055 30,204
Net income 3,092 3,092
Stock compensation expense 49 49
Foreign currency translation adjustment 4 4
Unrealized gain (loss) on marketable securities        
Stock options exercised (in shares)         47,000
Stock options exercised 104 $ 104
Balance (in shares) at Sep. 30, 2019 8,897,988        
Balance at Sep. 30, 2019 $ 89 $ 15,341 $ (124) $ 18,147 $ 33,453