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Note 8 - Retirement Plans (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Sep. 29, 2018
Sep. 30, 2017
Defined Benefit Plan, Plan Assets, Contributions by Employer $ 0 $ 0 $ 0 $ 0