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Note 8 - Shareholders' Equity (Details Textual) - USD ($)
$ / shares in Units, shares in Millions
3 Months Ended 6 Months Ended 140 Months Ended
Sep. 21, 2016
Aug. 27, 2016
May 28, 2016
Aug. 29, 2015
Aug. 27, 2016
Aug. 29, 2015
Aug. 27, 2016
Sep. 30, 2015
Subsequent Event [Member]                
Common Stock, Dividends, Per Share, Declared $ 0.125              
Stock Repurchase Program, Authorized Amount               $ 11,950,000,000
Treasury Stock, Shares, Acquired         6.5   187.4  
Payments for Repurchase of Common Stock         $ 299,486,000 $ 579,296,000 $ 10,000,000,000  
Stock Repurchase Program, Remaining Authorized Repurchase Amount   $ 2,000,000,000     $ 2,000,000,000   $ 2,000,000,000  
Common Stock, Dividends, Per Share, Declared   $ 0.125 $ 0.125 $ 0.25