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Consolidated Statements of Equity - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Accumulated Other Comprehensive Income (Loss) | Retained Earnings | Noncontrolling Interest
--- | --- | --- | --- | --- | --- | ---
Beginning Balance (in shares) at May. 31, 2012 |  | 35,429,641 |  |  |  |
Beginning Balance at May. 31, 2012 | $ 219,054 | $ 5,668 | $ 87,703 | $ (1,227) | $ 126,695 | $ 215
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 (in shares) at May. 31, 2013 |  | 36,084,021 |  |  |  |
Ending Balance at May. 31, 2013 | 258,287 | $ 5,773 | 99,935 | (1,372) | 153,885 | 66
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 (in shares) at May. 31, 2014 | 36,732,313 | 36,732,313 |  |  |  |
Ending Balance at May. 31, 2014 | $ 306,300 | $ 5,877 | 118,070 | 371 | 182,043 | (61)
Exercise of options and warrants, including share based compensation and income tax benefit (in shares) |  | 376,364 |  |  |  |
Exercise of options and warrants, including share based compensation and income tax benefit | $ 13,176 | $ 61 | 13,115 |  |  |
Issuance of shares under Employee Stock Purchase Plan (in shares) | 19,592 | 19,592 |  |  |  |
Issuance of shares under Employee Stock Purchase Plan | $ 724 | $ 3 | 721 |  |  |
Net income (loss) | 33,576 |  |  |  | 33,526 | 50
Other comprehensive income (loss) | $ (2,813) |  |  | (2,813) |  |
Ending Balance (in shares) at May. 31, 2015 | 37,128,269 | 37,128,269 |  |  |  |
Ending Balance at May. 31, 2015 | $ 350,963 | $ 5,941 | $ 131,906 | $ (2,442) | $ 215,569 | $ (11)

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