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Note 6 - Stock-based Compensation - Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Apr. 01, 2017
Apr. 02, 2016
Apr. 01, 2017
Apr. 02, 2016
Employee Stock Option [Member]        
Compensation expense $ 411 $ 383 $ 507 $ 466