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Note 5 - Supplemental Balance Sheet Information - Amortization of Intangible Assets (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 29, 2019
Sep. 30, 2020
Sep. 29, 2019
Amortization of intangible assets $ 149 $ 148 $ 444 $ 372
Research and Development Expense [Member]        
Amortization of intangible assets 31 32 92 98
Selling, General and Administrative Expenses [Member]        
Amortization of intangible assets $ 118 $ 116 $ 352 $ 274