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Note 6 - Stock-based Compensation - Non-cash Stock Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 29, 2019
Sep. 30, 2020
Sep. 29, 2019
Stock-based comepensation expense $ 222 $ 159 $ 756 $ 519
Share-based Payment Arrangement, Option [Member]        
Stock-based comepensation expense 204 117 674 433
Restricted Stock [Member]        
Stock-based comepensation expense $ 18 $ 42 $ 82 $ 86