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Note 5 - Capital Stock and Transactions With Related Parties (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  | 12 Months Ended | 72 Months Ended
--- | --- | --- | --- | --- | --- | ---
Aug. 04, 2017 | Jan. 27, 2017 | Apr. 29, 2016 | Jan. 25, 2013 | Apr. 28, 2018 | Apr. 29, 2017 | Apr. 30, 2016 | Apr. 28, 2018
Payments of Ordinary Dividends, Common Stock | $ 69,900 | $ 69,900 |  |  | $ 69,878 | $ 69,850 |  |
Common Stock, Dividends, Per Share, Cash Paid | $ 1.50 | $ 1.50 |  |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  |  | 1,600,000 |  |  |  |  |
Stock Repurchased During Period, Shares |  |  |  |  |  |  |  | 502,060
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased |  |  |  |  | 1,097,940 |  |  | 1,097,940
Increase (Decrease) in Shareholder Value |  |  |  |  | $ 4,800,000 |  |  |
Percentage Increase (Decrease) of Shareholder Value |  |  |  |  | 11000.00% |  |  |
CMA [Member] |  |  |  |  |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  |  |  | $ 9,800 | 8,300 | $ 7,000 |
Accounts Payable, Total |  |  |  |  | 2,400 | $ 2,100 |  | $ 2,400
Series D Preferred Stock [Member] |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  | 400,000 |  |  |  |
Preferred Stock, Par or Stated Value Per Share |  |  |  | $ 1 |  |  |  |
Stock Issued During Period, Value, New Issues |  |  |  | $ 20,000 |  |  |  |
Stock Redeemed or Called During Period, Shares |  |  | 120,000 |  |  |  |  |
Payments for Repurchase of Redeemable Preferred Stock |  |  | $ 6,000 |  |  |  |  |
Dividends Payable, Current |  |  |  |  | $ 0 |  |  | $ 0
Series C Preferred Stock [Member] |  |  |  |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share |  |  |  |  | $ 1 | $ 1 |  | $ 1
Preferred Stock, Shares Issued, Total |  |  |  |  | 150,000 | 150,000 |  | 150,000

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