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Consolidated Statements of Changes in Stockholders' Equity (Parentheticals) - $ / shares | May 27, 2018 | May 28, 2017 | May 29, 2016
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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 |  |

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