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Consolidated Statements of Stockholders' Equity (Unaudited) - 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 option exercise (in shares) 12,200         12,200
Shares issued – stock option exercise $ 29 52,693 $ 52,722
Stock-based compensation (in shares) 34,601          
Stock-based compensation $ 88 48,353       48,441
Net income       $ 5,248,459   5,248,459
Cash dividend       (2,549,684)   (2,549,684)
Translation adjustment         $ (631,301) (631,301)
Balance (in shares) at Sep. 30, 2014 10,245,534          
Balance at Sep. 30, 2014 $ 26,979 5,993,953 $ (2,894,068) 44,206,367 (543,052) 46,790,179
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
Shares issued – stock option exercise (in shares) 2,000         2,000
Shares issued – stock option exercise $ 5 9,915 $ 9,920
Stock-based compensation (in shares) 34,484          
Stock-based compensation $ 73 106,496 106,569
Net income       $ 4,063,647   4,063,647
Translation adjustment       $ (961,471) (961,471)
Balance (in shares) at Sep. 30, 2015 9,753,293          
Balance at Sep. 30, 2015 $ 27,062 $ 6,129,736 $ (6,602,930) $ 50,728,476 $ (1,649,529) 48,632,815
Purchase of treasury stock (in shares) (528,725)          
Purchase of treasury stock     $ (3,708,862)     $ (3,708,862)