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Note 9 - Commitments and Contingencies - Warranties (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Note 9 - Commitments And Contingencies - Warranties Details    
Balance, January 1 $ 376 $ 513
Warranties issued (90) 122
Settlements made (94) (259)
Balance, December 31 $ 192 $ 376