Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands		Common Stock Outstanding [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Total
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
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
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
Balance (in shares) at Dec. 31, 2020		8,885,797
Balance at Dec. 31, 2020			89	15,836	$ (1,639)	(140)	30,005	44,151
Net income							1,040	1,040
Stock compensation expense				57				57
Foreign currency translation adjustment						4		4
Common stock repurchased* (in shares)	[1]	(70,947)
Common stock repurchased*	[1]				(2,712)			(2,712)
Stock options exercised (in shares)		67,500
Stock options exercised			1	106				107
Balance (in shares) at Mar. 31, 2021		8,882,350
Balance at Mar. 31, 2021			90	15,999	(4,351)	(136)	31,045	42,647
Balance (in shares) at Dec. 31, 2020		8,885,797
Balance at Dec. 31, 2020			89	15,836	(1,639)	(140)	30,005	44,151
Net income								$ 6,379
Stock options exercised (in shares)								67,500
Balance (in shares) at Sep. 30, 2021		8,700,569
Balance at Sep. 30, 2021			90	16,229	(10,900)	(145)	36,384	$ 41,658
Balance (in shares) at Mar. 31, 2021		8,882,350
Balance at Mar. 31, 2021			90	15,999	(4,351)	(136)	31,045	42,647
Net income							2,805	2,805
Stock compensation expense				198				198
Foreign currency translation adjustment						4		4
Common stock repurchased* (in shares)	[1]	(144,194)
Common stock repurchased*	[1]				(5,048)			(5,048)
Stock compensation expense (in shares)		4,443
Balance (in shares) at Jun. 30, 2021		8,742,599
Balance at Jun. 30, 2021			90	16,197	(9,399)	(132)	33,850	40,606
Net income							2,534	2,534
Stock compensation expense				32				32
Foreign currency translation adjustment						(13)		(13)
Common stock repurchased* (in shares)	[1]	(42,030)
Common stock repurchased*	[1]				(1,501)			$ (1,501)
Stock options exercised (in shares)								0
Balance (in shares) at Sep. 30, 2021		8,700,569
Balance at Sep. 30, 2021			$ 90	$ 16,229	$ (10,900)	$ (145)	$ 36,384	$ 41,658

[1] At September 30, 2021, approximately $4,100,000 was authorized for future repurchases of our common stock.