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Note 6 - Leases (Details Textual) - USD ($)
Sep. 26, 2020
Jun. 27, 2020
Mar. 31, 2020
Sep. 28, 2019
Jun. 29, 2019
Apr. 01, 2019
Mar. 31, 2019
Stockholders' Equity Attributable to Parent, Ending Balance $ 432,052,000   $ 394,364,000 $ 412,662,000      
Retained Earnings [Member]              
Stockholders' Equity Attributable to Parent, Ending Balance $ 498,596,000 $ 480,491,000 $ 459,797,000 $ 413,211,000 $ 408,576,000   $ 409,504,000
Accounting Standards Update 2016-02 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Retained Earnings [Member]              
Stockholders' Equity Attributable to Parent, Ending Balance           $ 2,019,000