Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive 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		523			523
Exercise of stock awards, net of tax, shares	32,996
Exercise of stock awards, net of tax, amount					0
Stock repurchase and retirement (see Note 7), shares	(76,170)
Stock repurchase and retirement (see Note 7), amount		(773)			(773)
Foreign currency translation			1		1
Net income				686	686
Ending balance, shares at Dec. 31, 2019	3,786,398
Ending balance, amount at Dec. 31, 2019	$ 4	22,275	(16)	3,837	26,100
Stock-based compensation expense		273			273
Exercise of stock awards, net of tax, shares	68,252
Exercise of stock awards, net of tax, amount		451			451
Stock repurchase and retirement (see Note 7), shares	(83,898)
Stock repurchase and retirement (see Note 7), amount		(785)			(785)
Foreign currency translation			(3)		(3)
Net income				2,106	2,106
Ending balance, shares at Dec. 31, 2020	3,770,752
Ending balance, amount at Dec. 31, 2020	$ 4	$ 22,214	$ (19)	$ 5,943	$ 28,142