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Note 6 - Leases (Details Textual) - USD ($)
Dec. 26, 2020
Sep. 26, 2020
Jun. 27, 2020
Mar. 31, 2020
Dec. 28, 2019
Sep. 28, 2019
Jun. 29, 2019
Apr. 01, 2019
Mar. 31, 2019
Stockholders' Equity Attributable to Parent, Ending Balance $ 503,533,000     $ 394,364,000 $ 435,185,000        
Retained Earnings [Member]                  
Stockholders' Equity Attributable to Parent, Ending Balance $ 571,045,000 $ 498,596,000 $ 480,491,000 $ 459,797,000 $ 438,583,000 $ 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