Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Common Stock	Additional Paid-in Capital	Other Accumulated Comprehensive Income (Loss)	Retained Earnings	Total
Beginning balance, shares at Dec. 31, 2018	3,829,572
Beginning balance, amount at Dec. 31, 2018	$ 4	$ 22,525	$ (17)	$ 3,151	$ 25,663
Stock-based compensation expense		137			137
Exercise of stock awards, net of tax, shares	24,996
Exercise of stock awards, net of tax, amount	$ 0				0
Foreign currency translation			(3)		(3)
Net income				205	205
Ending balance, shares at Mar. 31, 2019	3,854,568
Ending balance, amount at Mar. 31, 2019	$ 4	22,662	(20)	3,356	26,002
Beginning balance, shares at Dec. 31, 2018	3,829,572
Beginning balance, amount at Dec. 31, 2018	$ 4	22,525	(17)	3,151	25,663
Foreign currency translation					(20)
Net income					617
Ending balance, shares at Sep. 30, 2019	3,837,588
Ending balance, amount at Sep. 30, 2019	$ 4	22,684	(37)	3,768	26,419
Beginning balance, shares at Mar. 31, 2019	3,854,568
Beginning balance, amount at Mar. 31, 2019	$ 4	22,662	(20)	3,356	26,002
Stock-based compensation expense		131			131
Exercise of stock awards, net of tax, shares	8,000
Exercise of stock awards, net of tax, amount	$ 0				0
Foreign currency translation			(10)		(10)
Net income				212	212
Ending balance, shares at Jun. 30, 2019	3,862,568
Ending balance, amount at Jun. 30, 2019	$ 4	22,793	(30)	3,568	26,335
Stock-based compensation expense		127			127
Exercise of stock awards, net of tax, shares	0
Exercise of stock awards, net of tax, amount	$ 0				0
Stock repurchase and retirement, shares	(24,980)
Stock repurchase and retirement, amount		(236)			(236)
Foreign currency translation			(7)		(7)
Net income				200	200
Ending balance, shares at Sep. 30, 2019	3,837,588
Ending balance, amount at Sep. 30, 2019	$ 4	22,684	(37)	3,768	26,419
Beginning balance, shares at Dec. 31, 2019	3,786,398
Beginning balance, amount at Dec. 31, 2019	$ 4	22,275	(16)	3,837	26,100
Stock-based compensation expense		45			45
Exercise of stock awards, net of tax, shares	8,002
Exercise of stock awards, net of tax, amount	$ 0				0
Stock repurchase and retirement, shares	(21,700)
Stock repurchase and retirement, amount		(203)			(203)
Foreign currency translation			40		40
Net income				226	226
Ending balance, shares at Mar. 31, 2020	3,772,700
Ending balance, amount at Mar. 31, 2020	$ 4	22,117	24	4,063	26,208
Beginning balance, shares at Dec. 31, 2019	3,786,398
Beginning balance, amount at Dec. 31, 2019	$ 4	22,275	(16)	3,837	26,100
Foreign currency translation					(5)
Net income					1,787
Ending balance, shares at Sep. 30, 2020	3,741,752
Ending balance, amount at Sep. 30, 2020	$ 4	21,757	(21)	5,624	27,364
Beginning balance, shares at Mar. 31, 2020	3,772,700
Beginning balance, amount at Mar. 31, 2020	$ 4	22,117	24	4,063	26,208
Stock-based compensation expense		84			84
Exercise of stock awards, net of tax, shares	24,000
Exercise of stock awards, net of tax, amount	$ 0				0
Stock repurchase and retirement, shares	(62,198)
Stock repurchase and retirement, amount		(582)			(582)
Foreign currency translation			(3)		(3)
Net income				772	772
Ending balance, shares at Jun. 30, 2020	3,734,502
Ending balance, amount at Jun. 30, 2020	$ 4	21,619	21	4,835	26,479
Stock-based compensation expense		72			72
Exercise of stock awards, net of tax, shares	7,250
Exercise of stock awards, net of tax, amount		66			66
Foreign currency translation			(42)		(42)
Net income				789	789
Ending balance, shares at Sep. 30, 2020	3,741,752
Ending balance, amount at Sep. 30, 2020	$ 4	$ 21,757	$ (21)	$ 5,624	$ 27,364