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Consolidated Statements of Changes in Stockholders' Equity (Parentheticals) - $ / shares
May 27, 2018
May 28, 2017
May 29, 2016
Common Stock [Member] | Minimum [Member]      
Issuance of common stock, per share (in dollars per share) $ 5.77 $ 5.63 $ 5.63
Issuance of common stock, per share (in dollars per share) 5.77 5.63 5.63
Common Stock [Member] | Maximum [Member]      
Issuance of common stock, per share (in dollars per share) 11.36 11.36 9.01
Issuance of common stock, per share (in dollars per share) 11.36 $ 11.36 $ 9.01
Issuance of common stock, per share (in dollars per share) 14.05    
Issuance of common stock, per share (in dollars per share) $ 14.05