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Note 7 - Commitments and Contingencies - Supplemental Lease Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Right-of-use asset, net and lease liabilities (in thousands) $ 2,889 $ 945
Cash paid for operating lease liabilities (in thousands) $ 1,033 $ 563
Weighted average remaining lease term (years) (Year) 3 years 182 days 1 year 36 days
Weighted average discount rate 3.80% 5.50%
Lease expense $ 1,052 $ 563
Cost of Sales [Member]    
Lease expense 725 230
General and Administrative Expense [Member]    
Lease expense 214 210
Research and Development Expense [Member]    
Lease expense $ 113 $ 123