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 at Jun. 30, 2016	$ 27,142	$ 6,281,711	$ (10,278,584)	$ 56,409,146	$ (1,432,926)	$ 51,006,489
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)
Exercise of stock options (in shares)
Stock-based compensation (in shares)	33,685
Stock-based compensation	$ 80	113,222				$ 113,302
Net income				3,341,912		3,341,912
Translation adjustment					254,753	254,753
Balance (in shares) at Jun. 30, 2016	9,266,496
Balance at Jun. 30, 2017	$ 27,153	6,762,832	(10,278,584)	61,728,490	(1,234,770)	57,005,121
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
Exercise of stock options (in shares)	44,400					44,400
Exercise of stock options	$ 107	223,297				$ 223,404
Stock-based compensation (in shares)	33,300
Stock-based compensation	$ 80	$ 171,080				171,160
Net income				$ 2,258,997		2,258,997
Translation adjustment					$ 658,359	$ 658,359
Balance (in shares) at Jun. 30, 2017	9,270,862