Changes In Stockholders' Equity (Schedule of Changes in Stockholders' Equity) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]
BALANCE	$ 60,955	$ 57,927	$ 58,324	$ 56,211
BALANCE, shares			7,154,591
Exercise of stock options	66	114	$ 322	173
Exercise of stock options, shares			107,813
Tax payments for shares withheld related to stock option exercises			$ (420)
Share issuances for director compensation			0	0
Share-based compensation	305	244	863	737
Issuance of common stock under Employee Stock Purchase Plan	224	203	224	203
Repurchase of common stock		(353)		(353)
Other comprehensive income (loss), net of tax	190	(268)	(50)	(96)
Net income (loss)	1,799	(353)	4,276	606
BALANCE	$ 63,539	57,514	$ 63,539	57,514
BALANCE, shares	7,254,684		7,254,684
Common Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
BALANCE	$ 37,053	$ 36,189	$ 36,659	$ 35,637
BALANCE, shares	7,232,000	7,115,000	7,155,000	7,101,000
Exercise of stock options	$ 66	$ 114	$ 322	$ 173
Exercise of stock options, shares	3,000	15,000	88,000	21
Tax payments for shares withheld related to stock option exercises			$ (420)
Tax payments for shares withheld related to stock option exercises (in shares)			16,000
Share issuances for director compensation			$ 0	$ 0
Share issuances for director compensation, shares			8,000	8,000
Share-based compensation	$ 305	$ 244	$ 863	$ 737
Issuance of common stock under Employee Stock Purchase Plan	$ 224	$ 203	$ 224	$ 203
Issuance of common stock under Employee Stock Purchase Plan, shares	20,000	18,000	20,000	18,000
Repurchase of common stock		$ (353)		$ (353)
Repurchase of common stock, shares		(26,000)		(26,000)
Other comprehensive income (loss), net of tax	$ 0	$ 0	$ 0	$ 0
Net income (loss)	0	0	0	0
BALANCE	$ 37,648	$ 36,397	$ 37,648	$ 36,397
BALANCE, shares	7,255,000	7,122,000	7,255,000	7,122,000
Accumulated Other Comprehensive Loss [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
BALANCE	$ (1,646)	$ (1,518)	$ (1,406)	$ (1,690)
Exercise of stock options	0	0	0	0
Tax payments for shares withheld related to stock option exercises			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
Repurchase of common stock		0		0
Other comprehensive income (loss), net of tax	190	(268)	(50)	(96)
Net income (loss)	0	0	0	0
BALANCE	(1,456)	(1,786)	(1,456)	(1,786)
Retained Earnings [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
BALANCE	25,548	23,256	23,071	22,264
Exercise of stock options	0	0	0	0
Tax payments for shares withheld related to stock option exercises			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
Repurchase of common stock		0		0
Other comprehensive income (loss), net of tax	0	0	0	0
Net income (loss)	1,799	(353)	4,276	606
BALANCE	$ 27,347	$ 22,903	$ 27,347	22,903
ASU No. 2016-02 [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Increase (decrease) related to adoption of ASU				33
ASU No. 2016-02 [Member] | Common Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Increase (decrease) related to adoption of ASU				0
ASU No. 2016-02 [Member] | Accumulated Other Comprehensive Loss [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Increase (decrease) related to adoption of ASU				0
ASU No. 2016-02 [Member] | Retained Earnings [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Increase (decrease) related to adoption of ASU				$ 33