Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Treasury Stock [Member]	Total
Balance (in shares) at Dec. 31, 2017	2,110,013				264,853
Balance at Dec. 31, 2017	$ 2,110	$ 30,598,920	$ (10,040,229)	$ (857,654)	$ (5,338,560)	$ 14,364,587
Net income (loss)			(238,305)			(238,305)
Foreign currency translation adjustment				25,228		25,228
Total comprehensive income						(213,077)
Stock-based compensation		7,534				7,534
Balance (in shares) at Mar. 31, 2018	2,110,013				264,853
Balance at Mar. 31, 2018	$ 2,110	30,606,454	(10,646,102)	(832,426)	$ (5,338,560)	13,791,476
Adoption of Accounting Standards Update 2014-09			(367,568)			(367,568)
Balance (in shares) at Dec. 31, 2018	2,110,013				264,853
Balance at Dec. 31, 2018	$ 2,110	30,622,547	(12,311,138)	(982,095)	$ (5,338,560)	11,992,864
Net income (loss)			623,644			623,644
Foreign currency translation adjustment				22,211		22,211
Total comprehensive income						645,855
Treasury stock acquired (Note 2) (in shares)					99,200
Treasury stock acquired (Note 2)					$ (540,144)	(540,144)
Other (in shares)					(489)
Other					$ 27,281	27,281
Stock-based compensation		5,306				5,306
Balance (in shares) at Mar. 31, 2019	2,110,013				363,564
Balance at Mar. 31, 2019	$ 2,110	$ 30,627,853	$ (11,687,494)	$ (959,884)	$ (5,851,423)	$ 12,131,162