Note 5 - Capital Stock and Transactions with Related Parties (Details) (USD $)	1 Months Ended	0 Months Ended	1 Months Ended	12 Months Ended		24 Months Ended		12 Months Ended				0 Months Ended		1 Months Ended	16 Months Ended
	Dec. 27, 2012	Feb. 14, 2011	Jan. 22, 2010	May 03, 2014	Apr. 27, 2013	May 03, 2014	Mar. 31, 2012	May 03, 2014 CMA [Member]	Apr. 27, 2013 CMA [Member]	Apr. 28, 2012 CMA [Member]	May 02, 2015 Series D Preferred Stock [Member] Scenario, Forecast [Member]	May 02, 2014 Series D Preferred Stock [Member]	May 03, 2014 Series D Preferred Stock [Member]	Jan. 25, 2013 Series D Preferred Stock [Member]	Apr. 30, 2014 Series D Preferred Stock [Member]	Apr. 27, 2013 Series D Preferred Stock [Member]	May 03, 2014 Series C Preferred Stock [Member]	Apr. 27, 2013 Series C Preferred Stock [Member]
Note 5 - Capital Stock and Transactions with Related Parties (Details) [Line Items]
Dividends, Common Stock, Cash	$ 118,100,000	$ 106,300,000	$ 62,300,000
Common Stock, Dividends, Per Share, Cash Paid (in Dollars per share)	$ 2.55	$ 2.30	$ 1.35
Stock Issued During Period, Shares, New Issues (in Shares)														400,000
Preferred Stock, Par or Stated Value Per Share (in Dollars per share)													$ 1	$ 1		$ 1	$ 1	$ 1
Stock Issued During Period, Value, New Issues														20,000,000
Temporary Equity, Liquidation Preference Per Share (in Dollars per share)														$ 50
Preferred Stock, Dividend Rate, Percentage													2.50%		3.00%
Preferred Stock Dividend Rate Basis Spread on Variable Rate											3.70%
Dividends Payable, Current													90,000			141,000
Preferred Stock, Redemption Price Per Share (in Dollars per share)													$ 50
Proceeds from Issuance of Preferred Stock and Preference Stock				(8,000,000)	19,704,000									19,700,000
Preferred Stock, Shares Issued (in Shares)													240,000			400,000	150,000	150,000
Stock Redeemed or Called During Period, Shares (in Shares)												160,000
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
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in Shares)					1,600,000		800,000
Stock Repurchased During Period, Shares (in Shares)						502,060
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased (in Shares)				1,097,940		1,097,940
Related Party Transaction, Amounts of Transaction								6,400,000	6,600,000	6,300,000
Accounts Payable								$ 1,600,000	$ 3,100,000