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Consolidated Statements of Changes in Stockholders' Equity (Parentheticals) - $ / shares | May 28, 2017 | May 29, 2016 | May 31, 2015
--- | --- | --- | ---
Common Stock [Member] | Minimum [Member] |  |  |
Issuance of common stock, per share (in dollars per share) | $ 5.63 | $ 5.63 | $ 5.63
Common Stock [Member] | Maximum [Member] |  |  |
Issuance of common stock, per share (in dollars per share) | 11.63 | $ 9.01 | $ 8.19
Issuance of common stock, per share (in dollars per share) | $ 13.65 |  |

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