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Note 5 - Supplemental Balance Sheet Information - Amortization of Intangible Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Amortization expense $ 235 $ 305
Research and Development Expense    
Amortization expense 130 176
SellingGeneralAndAdministrativeExpenses    
Amortization expense $ 105 $ 129