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Consolidated Statements of Equity (USD $) In Thousands, except Share data | Total | Common Stock | Additional Paid-in Capital | Accumulated Other Comprehensive Income (Loss) | Retained Earnings | Noncontrolling Interest
--- | --- | --- | --- | --- | --- | ---
Beginning Balance at May. 31, 2011 | $ 189,102 | $ 5,589 | $ 79,386 | $ (394) | $ 104,182 | $ 339
Beginning Balance (in shares) at May. 31, 2011 |  | 34,935,905 |  |  |  |
Exercise of options and warrants, including share based compensation and income tax benefit (in shares) |  | 472,520 |  |  |  |
Exercise of options and warrants, including share based compensation and income tax benefit | 7,887 | 76 | 7,811 |  |  |
Issuance of shares under Employee Stock Purchase Plan (in shares) | 21,216 | 21,216 |  |  |  |
Issuance of shares under Employee Stock Purchase Plan | 509 | 3 | 506 |  |  |
Net income (loss) | 22,389 |  |  |  | 22,513 | (124)
Other comprehensive income (loss) | (833) |  |  | (833) |  |
Ending Balance at May. 31, 2012 | 219,054 | 5,668 | 87,703 | (1,227) | 126,695 | 215
Ending Balance (in shares) at May. 31, 2012 |  | 35,429,641 |  |  |  |
Exercise of options and warrants, including share based compensation and income tax benefit (in shares) |  | 631,992 |  |  |  |
Exercise of options and warrants, including share based compensation and income tax benefit | 11,801 | 101 | 11,700 |  |  |
Issuance of shares under Employee Stock Purchase Plan (in shares) | 22,388 | 22,388 |  |  |  |
Issuance of shares under Employee Stock Purchase Plan | 536 | 4 | 532 |  |  |
Net income (loss) | 27,041 |  |  |  | 27,190 | (149)
Other comprehensive income (loss) | (145) |  |  | (145) |  |
Ending Balance at May. 31, 2013 | 258,287 | 5,773 | 99,935 | (1,372) | 153,885 | 66
Ending Balance (in shares) at May. 31, 2013 | 36,084,021 | 36,084,021 |  |  |  |
Exercise of options and warrants, including share based compensation and income tax benefit (in shares) |  | 629,826 |  |  |  |
Exercise of options and warrants, including share based compensation and income tax benefit | 17,623 | 101 | 17,522 |  |  |
Issuance of shares under Employee Stock Purchase Plan (in shares) | 18,466 | 18,466 |  |  |  |
Issuance of shares under Employee Stock Purchase Plan | 616 | 3 | 613 |  |  |
Net income (loss) | 28,031 |  |  |  | 28,158 | (127)
Other comprehensive income (loss) | 1,743 |  |  | 1,743 |  |
Ending Balance at May. 31, 2014 | $ 306,300 | $ 5,877 | $ 118,070 | $ 371 | $ 182,043 | $ (61)
Ending Balance (in shares) at May. 31, 2014 | 36,732,313 | 36,732,313 |  |  |  |

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