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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

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