Consolidated Statements of Stockholders' Equity (Unaudited) - 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, 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)	(520,482)
Purchase of treasury stock			(3,675,654)			(3,675,654)
Stock-based compensation (in shares)	33,685
Stock-based compensation	$ 80	156,506				156,586
Net income				4,342,262		4,342,262
Translation adjustment					222,187	$ 222,187
Exercise of stock options (in shares)
Balance (in shares) at Sep. 30, 2016	9,266,496
Balance at Sep. 30, 2016	$ 27,142	6,324,995	(10,278,584)	57,409,496	(1,465,492)	$ 52,017,557
Balance (in shares) at Dec. 31, 2016	9,193,162
Balance at Dec. 31, 2016	$ 26,966	6,368,455	(10,278,584)	59,469,493	(1,893,129)	53,693,201
Stock-based compensation (in shares)	33,300
Stock-based compensation	$ 80	205,300				205,380
Net income				2,780,411		2,780,411
Translation adjustment					1,028,599	$ 1,028,599
Exercise of stock options (in shares)	44,400					44,400
Exercise of stock options	$ 107	223,297				$ 223,404
Balance (in shares) at Sep. 30, 2017	9,270,862
Balance at Sep. 30, 2017	$ 27,153	$ 6,797,052	$ (10,278,584)	$ 62,249,904	$ (864,530)	$ 57,930,995