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Other Comprehensive Loss (Schedule Of Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
BALANCE $ (1,690) $ (1,409)
Other comprehensive income (loss) before reclassifications (96) (277)
Amounts reclassified from accumulated other comprehensive loss   (3)
Total change for the period   (324)
BALANCE (1,786) (1,733)
Foreign Currency Translation Adjustments    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
BALANCE (1,649) (1,394)
Other comprehensive income (loss) before reclassifications (199) (252)
Amounts reclassified from accumulated other comprehensive loss   0
Total change for the period   (252)
BALANCE (1,848) (1,646)
Available-for-sale Securities    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
BALANCE (41) (15)
Other comprehensive income (loss) before reclassifications 103 (25)
Amounts reclassified from accumulated other comprehensive loss   (3)
Total change for the period   (72)
BALANCE $ 62 (87)
ASU No. 2016-01 [Member]    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Decrease related to adoption of ASU 2016-01   (44)
ASU No. 2016-01 [Member] | Foreign Currency Translation Adjustments    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Decrease related to adoption of ASU 2016-01   0
ASU No. 2016-01 [Member] | Available-for-sale Securities    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Decrease related to adoption of ASU 2016-01   $ (44)