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Selected Statement of Operations Data (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Revenues $ 18,052 $ 20,928 $ 25,020
Product line "A" [Member]      
Revenues 14,544 16,567 20,990
Product line "B" [Member]      
Revenues $ 3,508 $ 4,361 $ 4,030