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Note 7 - Stockholders' Equity (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Jul. 03, 2021
Jun. 27, 2020
Mar. 31, 2021
Treasury Stock, Value, Acquired, Cost Method   $ 0  
Treasury Stock, Shares, Ending Balance (in shares) 3.2    
Treasury Stock, Value, Ending Balance $ 95,750 $ 88,319 $ 91,198
Common Class A [Member]      
Treasury Stock, Value, Acquired, Cost Method $ 4,600