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, 2012	10,162,442
Balance at Dec. 31, 2012	$ 26,775	$ 5,767,508	$ (2,894,068)	$ 34,241,875	$ 378,927	$ 37,521,017
Shares issued - stock options exercised (in shares)	36,291					49,000
Shares issued - stock options exercised	$ 87	113,713				$ 113,800
Stock-based compensation		11,686				11,686
Net income				7,265,717		7,265,717
Translation adjustment					(290,678)	(290,678)
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
Purchase of Treasury stock (in shares)						0
Shares issued - stock options exercised (in shares)	12,200					12,200
Shares issued - stock options exercised	$ 29	52,693				$ 52,722
Stock-based compensation	$ 93	67,725				67,818
Net income				7,706,921		7,706,921
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
Stock-based compensation (in shares)	34,601
Cash dividend paid				(2,549,684)		$ (2,549,684)
Purchase of Treasury stock (in shares)						0
Shares issued - stock options exercised (in shares)	2,000					2,000
Shares issued - stock options exercised	$ 5	9,915				$ 9,920
Stock-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
Stock-based compensation (in shares)	34,484
Purchase of Treasury stock (in shares)	(528,725)					(529,000)
Purchase of Treasury stock			$ (3,708,862)			$ (3,708,862)