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Note 6 - Capital Stock and Transactions With Related Parties (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended 400 Months Ended
Dec. 29, 2021
Jan. 29, 2021
Apr. 27, 2024
Apr. 29, 2023
Apr. 30, 2022
Apr. 27, 2024
Apr. 30, 2023
Payments of Ordinary Dividends, Common Stock $ 280,000 $ 280,000 $ (0) $ (0) $ 280,003    
Common Stock, Dividends, Per Share, Cash Paid (in dollars per share) $ 3 $ 3          
CMA [Member]              
Averaged Operating Costs     1,100        
Lease Buy-down Payments and Financing Costs         400    
Related Party Transaction, Amounts of Transaction     11,900 $ 11,700 $ 11,400    
Accounts Payable     $ 3,000     $ 3,000 $ 2,900
CMA [Member] | Annual Fee Agreement Based on Percentage of Consolidated Net Sales [Member]              
Related Party Transaction, Rate     1.00%        
Payment for Incentive Fee           $ 0