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Consolidated Statements of Changes in Stockholders' Equity (Parentheticals) - $ / shares
May. 31, 2015
May. 25, 2014
May. 26, 2013
Minimum [Member] | Parent [Member]      
Issuance of common stock, price per share (in dollars per share) $ 5.63 $ 5.63 $ 1.66
Maximum [Member] | Parent [Member]      
Issuance of common stock, price per share (in dollars per share) $ 8.19 $ 13.32 $ 13.22