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Changes In Stockholders' Equity (Schedule of Changes in Stockholders' Equity) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
BALANCE $ 57,927 $ 53,136 $ 56,211 $ 52,282
BALANCE, shares     7,100,825  
Exercise of stock options 114 201 $ 173  
Exercise of stock options, shares     21,050  
Exercise of stock options and vesting of restricted stock units       452
Share issuances for director compensation     $ 0 0
Share-based compensation 244 217 737 701
Issuance of common stock under Employee Stock Purchase Plan 203 219 203 219
Repurchase of common stock (353)   (353)  
Other comprehensive loss, net of tax (268) (50) (96) (280)
Net income (loss) (353) 1,067 606 1,634
BALANCE $ 57,514 54,790 $ 57,514 54,790
BALANCE, shares 7,121,671   7,121,671  
Common Stock [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
BALANCE $ 36,189 $ 34,815 $ 35,637 $ 34,080
BALANCE, shares 7,115,000 7,024,000 7,101,000 6,980,000
Exercise of stock options $ 114 $ 201 $ 173  
Exercise of stock options, shares 15,000 24 21,000  
Exercise of stock options and vesting of restricted stock units       $ 452
Exercise of stock options and vesting of restricted stock units, shares       60,000
Share issuances for director compensation     $ 0 $ 0
Share issuances for director compensation, shares     8,000 8,000
Share-based compensation $ 244 $ 217 $ 737 $ 701
Issuance of common stock under Employee Stock Purchase Plan $ 203 $ 219 $ 203 $ 219
Issuance of common stock under Employee Stock Purchase Plan, shares 18,000 16,000 18,000 16,000
Repurchase of common stock $ (353)   $ (353)  
Repurchase of common stock, shares (26,000)   (26,000)  
Other comprehensive loss, net of tax $ 0 $ 0 $ 0 $ 0
Net income (loss) 0 0 0 0
BALANCE $ 36,397 $ 35,452 $ 36,397 $ 35,452
BALANCE, shares 7,122,000 7,064,000 7,122,000 7,064,000
Accumulated Other Comprehensive Loss [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
BALANCE $ (1,518) $ (1,683) $ (1,690) $ (1,409)
Exercise of stock options 0 0 0  
Exercise of stock options and vesting of restricted stock units       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 loss, net of tax (268) (50) (96) (280)
Net income (loss) 0 0 0 0
BALANCE (1,786) (1,733) (1,786) (1,733)
Retained Earnings [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
BALANCE 23,256 20,004 22,264 19,611
Exercise of stock options 0 0 0  
Exercise of stock options and vesting of restricted stock units       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 loss, net of tax 0 0 0 0
Net income (loss) (353) 1,067 606 1,634
BALANCE $ 22,903 $ 21,071 22,903 21,071
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  
ASU No. 2016-01 [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Increase (decrease) related to adoption of ASU       0
ASU No. 2016-01 [Member] | Common Stock [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Increase (decrease) related to adoption of ASU       0
ASU No. 2016-01 [Member] | Accumulated Other Comprehensive Loss [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Increase (decrease) related to adoption of ASU       (44)
ASU No. 2016-01 [Member] | Retained Earnings [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Increase (decrease) related to adoption of ASU       44
ASU No. 2014-09 [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Increase (decrease) related to adoption of ASU       (218)
ASU No. 2014-09 [Member] | Common Stock [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Increase (decrease) related to adoption of ASU       0
ASU No. 2014-09 [Member] | Accumulated Other Comprehensive Loss [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Increase (decrease) related to adoption of ASU       0
ASU No. 2014-09 [Member] | Retained Earnings [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Increase (decrease) related to adoption of ASU       $ (218)