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Note 5 - Capital Stock and Transactions With Related Parties (Details Textual) - USD ($) |  |  |  |  |  |  | 12 Months Ended | 16 Months Ended | 24 Months Ended | 60 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 05, 2017 | Jan. 27, 2017 | Apr. 29, 2016 | Aug. 01, 2014 | May 02, 2014 | Jan. 25, 2013 | Apr. 29, 2017 | Apr. 30, 2016 | Apr. 30, 2016 | May 02, 2015 | Apr. 30, 2015 | Apr. 30, 2014 | Apr. 29, 2017 | Apr. 29, 2017 | May 01, 2014
Stock Redeemed or Called During Period, Shares |  |  | 120,000 |  |  |  |  |  |  |  |  |  |  |  |
Payments for Repurchase of Redeemable Preferred Stock |  |  | $ 6,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Accretion of Redemption Discount |  |  | $ 89,000 |  |  |  |  |  |  |  |  |  |  |  |
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 | 1,097,940 |
Increase (Decrease) in Shareholder Value |  |  |  |  |  |  | $ 4,500,000,000 |  |  |  |  |  |  |  |
Percentage Increase (Decrease) of Shareholder Value |  |  |  |  |  |  | 10000.00% |  |  |  |  |  |  |  |
Payments of Ordinary Dividends, Common Stock |  | $ 69,900,000 |  |  |  |  | $ 69,850,000 |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Cash Paid |  | $ 1.50 |  |  |  |  |  |  |  |  |  |  |  |  |
CMA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  |  |  |  |  | 8,300,000 |  | 7,000,000 | $ 6,500,000 |  |  |  |  |
Accounts Payable |  |  |  |  |  |  | 2,100,000 | $ 1,800,000 | 1,800,000 |  |  |  | $ 2,100,000 | $ 2,100,000 |
Series D Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Redeemed or Called During Period Percentage |  |  |  |  | 40.00% |  |  |  |  |  |  |  |  |  |
Stock Redeemed or Called During Period, Value |  |  |  |  | $ 8,000,000 |  |  |  |  |  |  |  |  |  |
Issuance Cost Related to Stock Redeemed |  |  |  |  | $ 118,000 |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  |  |  |  |  | 2.50% |  |  | 2.50% | 3.00% |  |  |
Stock Redeemed or Called During Period, Shares |  |  |  | 120,000 | 160,000 |  |  |  |  |  |  |  |  |  |
Stock Redeemed in Period, Percentage |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |
Payments for Repurchase of Redeemable Preferred Stock |  |  |  | $ 6,000,000 |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Accretion of Redemption Discount |  |  |  | $ 89,000 |  |  |  |  |  |  |  |  |  |  |
Preferred Stock Dividend Rate Basis Spread On Variable Rate |  |  |  |  |  |  |  |  |  |  |  |  | 3.70% |  |
Dividends Payable, Current |  |  |  |  |  |  | $ 0 | $ 0 | $ 0 |  |  |  | $ 0 | $ 0 |
Preferred Stock, Redemption Price Per Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50
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 |  |  |  |  |  | $ 20,000,000 |  |  |  |  |  |  |  |  |
Temporary Equity, Liquidation Preference Per Share |  |  |  |  |  | $ 50 |  |  |  |  |  |  |  |  |
Series C Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Issued |  |  |  |  |  |  | 150,000 | 150,000 | 150,000 |  |  |  | 150,000 | 150,000 |
Preferred Stock, Par or Stated Value Per Share |  |  |  |  |  |  | $ 1 | $ 1 | $ 1 |  |  |  | $ 1 | $ 1 |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared | $ 1.50 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable, Date of Record | Jun. 05, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable, Date to be Paid | Aug. 04, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable | $ 69,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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