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Note 6 - Stock-based Compensation - Stock Option Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Mar. 31, 2018
Apr. 01, 2017
Employee Stock Option [Member]        
Compensation expense $ 381 $ 411 $ 471 $ 507