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Note 7 - Stock-based Compensation - Non-cash Stock Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 29, 2019
Sep. 30, 2018
Sep. 29, 2019
Sep. 30, 2018
Stock-based comepensation expense $ 159 $ 363 $ 519 $ 707
Share-based Payment Arrangement, Option [Member]        
Stock-based comepensation expense 117 344 433 653
Restricted Stock [Member]        
Stock-based comepensation expense $ 42 $ 19 $ 86 $ 54