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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

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