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Note 3 - Supplemental Balance Sheet Information - Amortization of Intangible Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Amortization of Intangible Assets $ 397 $ 422
Research and Development Expense [Member]    
Amortization of Intangible Assets 147 165
Selling, General and Administrative Expenses [Member]    
Amortization of Intangible Assets $ 250 $ 257