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Note 6 - Capital Stock and Transactions With Related Parties (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended 412 Months Ended
Jul. 24, 2024
May 03, 2025
Apr. 27, 2024
Apr. 29, 2023
May 03, 2025
Common Stock, Dividends, Per Share, Cash Paid (in dollars per share) $ 3.25        
Payments of Ordinary Dividends, Common Stock $ 304,100 $ 304,148 $ (0) $ (0)  
CMA [Member]          
Averaged Operating Costs   1,100      
Related Party Transaction, Amounts of Transaction   12,000 11,900 $ 11,700  
Accounts Payable   $ 2,100 $ 3,000   $ 2,100
CMA [Member] | Annual Fee Agreement Based on Percentage of Consolidated Net Sales [Member]          
Related Party Transaction, Rate   1.00%      
Payment for Incentive Fee         $ 0