Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Dec. 31, 2018	8,817,988
Balance at Dec. 31, 2018	$ 88	$ 15,050	$ (92)	$ 10,875	$ 25,921
Stock options exercised (in shares)	33,000
Stock options exercised	$ 1	58			59
Net income				2,072	2,072
Stock compensation expense		25			25
Foreign currency translation adjustment			(1)		(1)
Balance (in shares) at Mar. 31, 2019	8,850,988
Balance at Mar. 31, 2019	$ 89	15,133	(93)	12,947	28,076
Balance (in shares) at Dec. 31, 2018	8,817,988
Balance at Dec. 31, 2018	$ 88	15,050	(92)	10,875	25,921
Net income					7,272
Balance (in shares) at Sep. 30, 2019	8,897,988
Balance at Sep. 30, 2019	$ 89	15,341	(124)	18,147	33,453
Balance (in shares) at Mar. 31, 2019	8,850,988
Balance at Mar. 31, 2019	$ 89	15,133	(93)	12,947	28,076
Net income				2,108	2,108
Stock compensation expense		55			55
Foreign currency translation adjustment			(35)		(35)
Balance (in shares) at Jun. 30, 2019	8,850,988
Balance at Jun. 30, 2019	$ 89	15,188	(128)	15,055	30,204
Stock options exercised (in shares)	47,000
Stock options exercised		104			104
Net income				3,092	3,092
Stock compensation expense		49			49
Foreign currency translation adjustment			4		4
Balance (in shares) at Sep. 30, 2019	8,897,988
Balance at Sep. 30, 2019	$ 89	15,341	(124)	18,147	33,453
Balance (in shares) at Dec. 31, 2019	8,924,988
Balance at Dec. 31, 2019	$ 89	15,450	(94)	21,844	37,289
Net income				1,047	1,047
Stock compensation expense		62			62
Foreign currency translation adjustment			(31)		(31)
Balance (in shares) at Mar. 31, 2020	8,924,988
Balance at Mar. 31, 2020	$ 89	15,512	(125)	22,891	38,367
Balance (in shares) at Dec. 31, 2019	8,924,988
Balance at Dec. 31, 2019	$ 89	15,450	(94)	21,844	$ 37,289
Stock options exercised (in shares)					0
Net income					$ 6,042
Balance (in shares) at Sep. 30, 2020	8,929,368
Balance at Sep. 30, 2020	$ 89	15,780	(129)	27,886	43,626
Balance (in shares) at Mar. 31, 2020	8,924,988
Balance at Mar. 31, 2020	$ 89	15,512	(125)	22,891	38,367
Net income				2,200	2,200
Stock compensation expense		61			61
Foreign currency translation adjustment			(15)		(15)
Balance (in shares) at Jun. 30, 2020	8,924,988
Balance at Jun. 30, 2020	$ 89	15,573	(140)	25,091	$ 40,613
Stock options exercised (in shares)					0
Net income				2,795	$ 2,795
Stock compensation expense		207			207
Foreign currency translation adjustment			11		11
Balance (in shares) at Sep. 30, 2020	8,929,368
Balance at Sep. 30, 2020	$ 89	$ 15,780	$ (129)	$ 27,886	$ 43,626
Stock compensation expense (in shares)	4,380