Consolidated Statements of Stockholders' Equity (Unaudited) (USD $)	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings, Unappropriated [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Comprehensive Income [Member]
BALANCE, at Dec. 31, 2009	$ 33,359,655	$ 26,453	$ 5,491,736	$ (2,452,649)	$ 29,959,910	$ 334,205
BALANCE, (in Shares) at Dec. 31, 2009		10,130,628
Shares issued - stock options	166,466	302	166,164
Shares issued - stock options (in Shares)		126,114
Stock-based compensation	18,388		18,388
Purchase of treasury stock	(8,419)			(8,419)
Purchase of treasury stock (in Shares)		(2,300)
Net income	2,009,223				2,009,223		2,099,223
Cash dividend	(7,690,832)				(7,690,832)
Translation adjustment	(59,693)					(59,693)	(59,693)
Comprehensive income for the six months							1,949,530
BALANCE, at Jun. 30, 2010	27,794,788	26,755	5,676,288	(2,461,068)	24,278,301	274,512
BALANCE, (in Shares) at Jun. 30, 2010		10,254,442
BALANCE, at Dec. 31, 2010	29,761,594	26,760	5,703,387	(2,894,068)	26,429,335	496,180
BALANCE, (in Shares) at Dec. 31, 2010	10,156,442	10,156,442
Stock-based compensation	26,030		26,030
Net income	2,226,932				2,226,932		2,226,932
Translation adjustment	127,433					127,433	127,433
Comprehensive income for the six months							2,354,365
BALANCE, at Jun. 30, 2011	$ 32,141,989	$ 26,760	$ 5,729,417	$ (2,894,068)	$ 28,656,267	$ 623,613
BALANCE, (in Shares) at Jun. 30, 2011	10,156,442	10,156,442