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Note 6 - Stock-based Compensation - RSU Grants and Compensation Expense (Details) - Restricted Stock Units (RSUs) [Member] - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Mar. 31, 2018
Apr. 01, 2017
Units (in shares) 24 19 24 19
Market value $ 712 $ 690 $ 712 $ 690
Compensation expense $ 457 $ 465 $ 602 $ 626