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, 2009	$ 26,453	$ 5,491,736	$ (2,452,649)	$ 29,959,910	$ 334,205	$ 33,359,655
BALANCE, (in Shares) at Dec. 31, 2009	10,130,628
Shares issued - stock options exercised	307	169,959				170,266
Shares issued - stock options exercised (in Shares)	128,114
Stock-based compensation		41,692				41,692
Purchase of treasury stock			(441,419)			(441,419)
Purchase of treasury stock (in Shares)	(102,300)
Net income				4,160,257		4,160,257
Cash dividend paid				(7,690,832)		(7,690,832)
Translation adjustment					161,975	161,975
BALANCE, at Dec. 31, 2010	26,760	5,703,387	(2,894,068)	26,429,335	496,180	29,761,594
BALANCE, (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, (in Shares) at Dec. 31, 2011	10,156,442					11,150,065
Shares issued - stock options exercised	15	20,965				20,980
Shares issued - stock options exercised (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, (in Shares) at Dec. 31, 2012	10,162,442					11,152,065