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Consolidated Statements of Stockholders' Equity - USD ($) | Common Stock [Member] | Additional Paid-in Capital [Member] | Treasury Stock [Member] | Retained Earnings [Member] | AOCI Attributable to Parent [Member] | Total
--- | --- | --- | --- | --- | --- | ---
Balance (in shares) at Dec. 31, 2013 | 10,198,733 |  |  |  |  |
Balance at Dec. 31, 2013 | $ 26,862 | $ 5,892,907 | $ (2,894,068) | $ 41,507,592 | $ 88,249 | $ 44,621,542
Shares issued - stock options exercised (in shares) | 12,200 |  |  |  |  | 2,000
Shares issued - stock options exercised | $ 29 | 52,693 |  |  |  | $ 52,722
Share-based compensation (in shares) | 34,601 |  |  |  |  |
Share-based compensation | $ 93 | 67,725 |  |  |  | 67,818
Net income |  |  |  | 7,706,921 |  | 7,706,921
Cash dividend paid |  |  |  | (2,549,684) |  | (2,549,684)
Translation adjustment |  |  |  |  | (776,307) | (776,307)
Balance (in shares) at Dec. 31, 2014 | 10,245,534 |  |  |  |  |
Balance at Dec. 31, 2014 | $ 26,984 | 6,013,325 | (2,894,068) | 46,664,829 | (688,058) | $ 49,123,012
Purchase of Treasury stock (in shares) |  |  |  |  |  | 0
Shares issued - stock options exercised (in shares) | 2,000 |  |  |  |  |
Shares issued - stock options exercised | $ 5 | 9,915 |  |  |  | $ 9,920
Share-based compensation (in shares) | 34,484 |  |  |  |  |
Share-based compensation | $ 73 | 145,249 |  |  |  | 145,322
Net income |  |  |  | 6,402,405 |  | 6,402,405
Translation adjustment |  |  |  |  | (999,621) | (999,621)
Balance (in shares) at Dec. 31, 2015 | 9,753,293 |  |  |  |  |
Balance at Dec. 31, 2015 | $ 27,062 | 6,168,489 | (6,602,930) | 53,067,234 | (1,687,679) | $ 50,972,176
Purchase of Treasury stock (in shares) | (528,725) |  |  |  |  | (529,000)
Purchase of Treasury stock |  |  | (3,708,862) |  |  | $ (3,708,862)
Share-based compensation (in shares) | 33,685 |  |  |  |  |
Share-based compensation | $ 80 | 199,790 |  |  |  | 199,870
Net income |  |  |  | 6,402,259 |  | 6,402,259
Translation adjustment |  |  |  |  | (205,450) | (205,450)
Balance (in shares) at Dec. 31, 2016 | 9,266,496 |  |  |  |  |
Balance at Dec. 31, 2016 | $ 27,142 | 6,368,279 | (10,278,584) | 59,469,493 | (1,893,129) | $ 53,693,201
Purchase of Treasury stock (in shares) | (520,482) |  |  |  |  | (520,500)
Purchase of Treasury stock |  |  | $ (3,675,654) |  |  | $ (3,675,654)

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