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Consolidated Statements of Stockholders' Equity (USD $)
Common Stock [Member]
Additional Paid-in Capital [Member]
Treasury Stock [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Total
Balance at Dec. 31, 2010 $ 26,760 $ 5,703,387 $ (2,894,068) $ 26,429,335 $ 496,180 $ 29,761,594
Balance (shares) (in Shares) at Dec. 31, 2010 10,156,442          
Stock-based compensation   33,156       33,156
Net income       4,752,601   4,752,601
Translation adjustment         (113,550) (113,550)
Balance at Dec. 31, 2011 26,760 5,736,543 (2,894,068) 31,181,936 382,630 34,433,801
Balance (shares) (in Shares) at Dec. 31, 2011 10,156,442          
Shares issued - stock options exercised 15 20,965       20,980
Shares issued - stock options exercised (shares) (in Shares) 6,000          
Stock-based compensation   10,000       10,000
Net income       5,596,070   5,596,070
Cash dividend paid       (2,536,131)   (2,536,131)
Translation adjustment         (3,703) (3,703)
Balance at Dec. 31, 2012 26,775 5,767,508 (2,894,068) 34,241,875 378,927 37,521,017
Balance (shares) (in Shares) at Dec. 31, 2012 10,162,442         11,156,065
Shares issued - stock options exercised 87 113,713       113,800
Shares issued - stock options exercised (shares) (in Shares) 36,291          
Stock-based compensation   11,686       11,686
Net income       7,265,717   7,265,717
Translation adjustment         (290,678) (290,678)
Balance at Dec. 31, 2013 $ 26,862 $ 5,892,907 $ (2,894,068) $ 41,507,592 $ 88,249 $ 44,621,542
Balance (shares) (in Shares) at Dec. 31, 2013 10,198,733         11,192,356