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, 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 options exercised (in shares)	12,200					2,000
Shares issued - stock options exercised	$ 29	52,693				$ 52,722
Share-based compensation (in shares)	34,601
Share-based compensation	$ 93	67,725				67,818
Net income				7,706,921		7,706,921
Cash dividend paid				(2,549,684)		(2,549,684)
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
Purchase of Treasury stock (in shares)						0
Shares issued - stock options exercised (in shares)	2,000
Shares issued - stock options exercised	$ 5	9,915				$ 9,920
Share-based compensation (in shares)	34,484
Share-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
Purchase of Treasury stock (in shares)	(528,725)					(529,000)
Purchase of Treasury stock			(3,708,862)			$ (3,708,862)
Share-based compensation (in shares)	33,685
Share-based compensation	$ 80	199,790				199,870
Net income				6,402,259		6,402,259
Translation adjustment					(205,450)	(205,450)
Balance (in shares) at Dec. 31, 2016	9,266,496
Balance at Dec. 31, 2016	$ 27,142	6,368,279	(10,278,584)	59,469,493	(1,893,129)	$ 53,693,201
Purchase of Treasury stock (in shares)	(520,482)					(520,500)
Purchase of Treasury stock			$ (3,675,654)			$ (3,675,654)