Changes In Stockholders' Equity (Schedule of Changes in Stockholders' Equity) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Increase (Decrease) in Stockholders' Equity [Roll Forward]
BALANCE	$ 70,591	$ 60,955	$ 65,528	$ 58,324
BALANCE, shares			7,294,617
Exercise of stock options, net of shares exchanged as payment	226	66	$ 292	322
Exercise of stock options, net of shares exchanged as payment, shares			77,125
Tax payments for shares withheld related to stock option exercises	(727)		$ (727)	(420)
Share issuances for director compensation			0	0
Share-based compensation	327	305	999	863
Issuance of common stock under Employee Stock Purchase Plan	247	224	247	224
Other comprehensive income (loss), net of tax	(184)	190	(409)	(50)
Net income	4,798	1,799	9,348	4,276
BALANCE	$ 75,278	63,539	$ 75,278	63,539
BALANCE, shares	7,355,549		7,355,549
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
BALANCE	$ 38,555	$ 37,053	$ 37,817	$ 36,659
BALANCE, shares	7,308,000	7,232,000	7,295,000	7,155,000
Exercise of stock options, net of shares exchanged as payment	$ 226	$ 66	$ 292	$ 322
Exercise of stock options, net of shares exchanged as payment, shares	58,000	3,000	63,000	88,000
Tax payments for shares withheld related to stock option exercises	$ (727)		$ (727)	$ (420)
Tax payments for shares withheld related to stock option exercises (in shares)	(17,000)		(17,000)	(16,000)
Share issuances for director compensation			$ 0	$ 0
Share issuances for director compensation, shares			8,000	8,000
Share-based compensation	$ 327	$ 305	$ 999	$ 863
Issuance of common stock under Employee Stock Purchase Plan	$ 247	$ 224	$ 247	$ 224
Issuance of common stock under Employee Stock Purchase Plan, shares	7,000	20,000	7,000	20,000
Other comprehensive income (loss), net of tax	$ 0	$ 0	$ 0	$ 0
Net income	0	0	0	0
BALANCE	$ 38,628	$ 37,648	$ 38,628	$ 37,648
BALANCE, shares	7,356,000	7,255,000	7,356,000	7,255,000
Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
BALANCE	$ (1,327)	$ (1,646)	$ (1,102)	$ (1,406)
Exercise of stock options, net of shares exchanged as payment	0	0	0	0
Tax payments for shares withheld related to stock option exercises	0		0	0
Share issuances for director compensation			0	0
Share-based compensation	0	0	0	0
Issuance of common stock under Employee Stock Purchase Plan	0	0	0	0
Other comprehensive income (loss), net of tax	(184)	190	(409)	(50)
Net income	0	0	0	0
BALANCE	(1,511)	(1,456)	(1,511)	(1,456)
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
BALANCE	33,363	25,548	28,813	23,071
Exercise of stock options, net of shares exchanged as payment	0	0	0	0
Tax payments for shares withheld related to stock option exercises	0		0	0
Share issuances for director compensation			0	0
Share-based compensation	0	0	0	0
Issuance of common stock under Employee Stock Purchase Plan	0	0	0	0
Other comprehensive income (loss), net of tax	0	0	0	0
Net income	4,798	1,799	9,348	4,276
BALANCE	$ 38,161	$ 27,347	$ 38,161	$ 27,347