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Note 11 - Stockholders' Equity (Tables) | 9 Months Ended
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Feb. 28, 2016
Notes Tables |
Schedule of Stockholders Equity [Table Text Block] |
|  | February 28, 2016 |
Common Stock Shares |  |  |  |
Balance at May 31, 2015 |  |  | 26,990,490 |
Stock options exercised, net of shares tendered |  |  | 72,673 |
Vested restricted stock units, net of shares tendered |  |  | 8,114 |
Balance at February 28, 2016 |  |  | 27,071,277 |
Common Stock |  |  |  |
Balance at May 31, 2015 |  | $ | 27 |
Stock options exercised, net of shares tendered |  |  | — |
Vested restricted stock units, net of shares tendered |  |  | — |
Balance at February 28, 2016 |  | $ | 27 |
Additional Paid-in Capital |  |  |  |
Balance at May 31, 2015 |  | $ | 133,307 |
Stock options exercised, net of shares tendered |  |  | 282 |
Vested restricted stock units, net of shares tendered |  |  | — |
Taxes paid by Company for stock swaps and RSUs |  |  | — |
Stock-based compensation expense |  |  | 2,581 |
Tax benefit from stock based compensation expense |  |  | 133 |
Balance at February 28, 2016 |  | $ | 136,303 |
Retained Earnings |  |  |  |
Balance at May 31, 2015 |  | $ | 85,098 |
Net loss applicable to common stockholders |  |  | (16,370 | )
Balance at February 28, 2016 |  | $ | 68,728 |
Non - controlling Interest |  |  |  |
Balance at May 31, 2015 |  | $ | 1,677 |
Non-controlling interest in net income |  |  | 119 |
Distributions to non-controlling interest |  |  | (248 | )
Balance at February 28, 2016 |  | $ | 1,548 |

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- Definition Tabular disclosure of changes in the separate accounts comprising stockholders' equity (in addition to retained earnings) and of the changes in the number of shares of equity securities during at least the most recent annual fiscal period and any subsequent interim period presented is required to make the financial statements sufficiently informative if both financial position and results of operations are presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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