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Consolidated Statements of Shareholders&#8217; Equity - USD ($) | Common Stock [Member] | Additional Paid-in Capital [Member] | AOCI Attributable to Parent [Member] | Retained Earnings [Member] | Total
--- | --- | --- | --- | --- | ---
Balance (in shares) at Dec. 31, 2017 | 14,290,749 |  |  |  |  |
Balance at Dec. 31, 2017 | $ 143,000 | $ 5,415,000 | $ (458,000) | $ 26,223,000 | $ 31,323,000 |
Common stock repurchased and retired (in shares) | (999,900) |  |  |  | (999,900) |
Common stock repurchased and retired | $ (10,000) | (3,570,000) |  |  | $ (3,580,000) |
Share-based compensation expense |  | 432,000 |  |  | $ 432,000 |
Options exercised (in shares) | 211,835 |  |  |  | 211,835 |
Options exercised | $ 2,000 | 392,000 |  |  | $ 394,000 |
Net income |  |  |  | 3,625,000 | $ 3,625,000 |
Balance (in shares) at Dec. 31, 2018 | 13,502,684 |  |  |  | 13,502,684 | [1]
Balance at Dec. 31, 2018 | $ 135,000 | 2,669,000 |  | 29,390,000 | $ 32,194,000 | [2]
Cumulative-effect adjustment of change in accounting for unrealized loss on marketable securities |  |  | 458,000 | (458,000) |  |
Common stock repurchased and retired (in shares) | (683,910) |  |  |  | (683,910) |
Common stock repurchased and retired | $ (6,000) | (2,542,000) |  |  | $ (2,548,000) |
Share-based compensation expense |  | 451,000 |  |  | $ 451,000 |
Options exercised (in shares) | 66,499 |  |  |  | 66,499 |
Options exercised |  | 130,000 |  |  | $ 130,000 |
Net income |  |  |  | 3,000,000 | $ 3,000,000 |
Balance (in shares) at Dec. 31, 2019 | 12,885,273 |  |  |  | 12,885,273 |
Balance at Dec. 31, 2019 | $ 129,000 | $ 708,000 |  | $ 32,390,000 | $ 33,227,000 |
[1] | The condensed consolidated balance sheet as of December 31, 2018 has been prepared using information from the audited consolidated balance sheet as of that date.
[2] | The condensed consolidated balance sheet as of December 31, 2018 has been prepared using information from the audited consolidated balance sheet as of that date.

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