Changes In Stockholders' Equity (Schedule of Changes in Stockholders' Equity) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Increase (Decrease) in Stockholders' Equity [Roll Forward]
BALANCE	$ 67,156	$ 59,035	$ 65,528	$ 58,324
BALANCE, shares			7,294,617
Exercise of stock options, net of shares exchanged as payment	10	171	$ 67	256
Exercise of stock options, net of shares exchanged as payment, shares			7,875
Tax payments for shares withheld related to stock option exercises		(420)		(420)
Share issuances for director compensation	0	0	$ 0	0
Share-based compensation	337	286	671	558
Other comprehensive income (loss), net of tax	(21)	250	(225)	(240)
Net income	3,109	1,633	4,550	2,477
BALANCE	$ 70,591	60,955	$ 70,591	60,955
BALANCE, shares	7,308,001		7,308,001
Common Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
BALANCE	$ 38,208	$ 37,016	$ 37,817	$ 36,659
BALANCE, shares	7,299,000	7,165,000	7,295,000	7,155,000
Exercise of stock options, net of shares exchanged as payment	$ 10	$ 171	$ 67	$ 256
Exercise of stock options, net of shares exchanged as payment, shares	1,000	75,000	5,000	85,000
Tax payments for shares withheld related to stock option exercises		$ (420)		$ (420)
Tax payments for shares withheld related to stock option exercises (in shares)		16,000		16,000
Share issuances for director compensation	$ 0	$ 0	$ 0	$ 0
Share issuances for director compensation, shares	8,000	8,000	8,000	8,000
Share-based compensation	$ 337	$ 286	$ 671	$ 558
Other comprehensive income (loss), net of tax	0	0	0	0
Net income	0	0	0	0
BALANCE	$ 38,555	$ 37,053	$ 38,555	$ 37,053
BALANCE, shares	7,308,000	7,232,000	7,308,000	7,232,000
Accumulated Other Comprehensive Loss [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
BALANCE	$ (1,306)	$ (1,896)	$ (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
Share issuances for director compensation	0	0	0	0
Share-based compensation	0	0	0	0
Other comprehensive income (loss), net of tax	(21)	250	(225)	(240)
Net income	0	0	0	0
BALANCE	(1,327)	(1,646)	(1,327)	(1,646)
Retained Earnings [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
BALANCE	30,254	23,915	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
Share issuances for director compensation	0	0	0	0
Share-based compensation	0	0	0	0
Other comprehensive income (loss), net of tax	0	0	0	0
Net income	3,109	1,633	4,550	2,477
BALANCE	$ 33,363	$ 25,548	$ 33,363	$ 25,548