Changes In Stockholders' Equity (Schedule of Changes in Stockholders' Equity) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]
BALANCE	$ 59,035	$ 57,175	$ 58,324	$ 56,211
BALANCE, shares			7,154,591
Exercise of stock options	171		$ 256
Exercise of stock options, shares			104,613
Exercise of stock options and vesting of restricted stock units				59
Tax payments for shares withheld related to stock option exercises	(420)		$ (420)
Share issuances for director compensation	0	0	0	0
Share-based compensation	286	249	558	493
Other comprehensive loss, net of tax	250	39	(240)	172
Net income (loss)	1,633	464	2,477	959
BALANCE	$ 60,955	57,927	$ 60,955	57,927
BALANCE, shares	7,231,587		7,231,587
Common Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
BALANCE	$ 37,016	$ 35,940	$ 36,659	$ 35,637
BALANCE, shares	7,165,000	7,107,000	7,155,000	7,101,000
Exercise of stock options	$ 171		$ 256
Exercise of stock options, shares	75,000		85,000
Exercise of stock options and vesting of restricted stock units				$ 59
Exercise of stock options and vesting of restricted stock units, shares				6,000
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)
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	$ 286	$ 249	$ 558	$ 493
Other comprehensive loss, net of tax	0	0	0	0
Net income (loss)	0	0	0	0
BALANCE	$ 37,053	$ 36,189	$ 37,053	$ 36,189
BALANCE, shares	7,232,000	7,115,000	7,232,000	7,115,000
Accumulated Other Comprehensive Loss [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
BALANCE	$ (1,896)	$ (1,557)	$ (1,406)	$ (1,690)
Exercise of stock options	0		0
Exercise of stock options and vesting of restricted stock units				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 loss, net of tax	250	39	(240)	172
Net income (loss)	0	0	0	0
BALANCE	(1,646)	(1,518)	(1,646)	(1,518)
Retained Earnings [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
BALANCE	23,915	22,792	23,071	22,264
Exercise of stock options	0		0
Exercise of stock options and vesting of restricted stock units				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 loss, net of tax	0	0	0	0
Net income (loss)	1,633	464	2,477	959
BALANCE	$ 25,548	$ 23,256	$ 25,548	23,256
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