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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Common Stock | Additional Paid-in Capital | Retained Earnings | Accumulated Other Comprehensive Gain (Loss) | Non-controlling Interests | Total
--- | --- | --- | --- | --- | --- | ---
Balances at Jan. 31, 2015 | $ 2,195 | $ 109,663 | $ 73,614 |  | $ (10,520) | $ 174,952
Balances (in shares) at Jan. 31, 2015 | 14,631,201 |  |  |  |  |
Net income |  |  | 36,345 |  | 13,859 | 50,204
Foreign currency translation gain (loss) |  |  |  | $ (565) |  | (565)
Acquisition of APC | $ 15 | 3,521 |  |  |  | 3,536
Acquisition of APC (in shares) | 98,818 |  |  |  |  |
Exercise of stock options | $ 16 | 1,802 |  |  |  | $ 1,818
Exercise of stock options (in shares) | 106,450 |  |  |  |  | 106,000
Stock option vesting |  | 2,374 |  |  |  | $ 2,374
Excess tax benefit on exercised stock options |  | (86) |  |  |  | (86)
Cash dividends |  |  | (10,378) |  |  | (10,378)
Balances at Jan. 31, 2016 | $ 2,226 | 117,274 | 99,581 | (565) | 3,339 | 221,855
Balances (in shares) at Jan. 31, 2016 | 14,836,469 |  |  |  |  |
Net income |  |  | 70,328 |  | 7,098 | 77,426
Foreign currency translation gain (loss) |  |  |  | (197) |  | (197)
Exercise of stock options | $ 93 | 15,808 |  |  |  | $ 15,901
Exercise of stock options (in shares) | 621,750 |  |  |  |  | 622,000
Stock option vesting |  | 2,344 |  |  |  | $ 2,344
Cash distributions to joint venture partner |  |  |  |  | (9,500) | (9,500)
Cash dividends |  |  | (15,260) |  |  | (15,260)
Balances at Jan. 31, 2017 | $ 2,319 | 135,426 | 154,649 | (762) | 937 | 292,569
Balances (in shares) at Jan. 31, 2017 | 15,458,219 |  |  |  |  |
Net income |  |  | 72,011 |  | 335 | 72,346
Foreign currency translation gain (loss) |  |  |  | 2,184 |  | 2,184
Exercise of stock options | $ 17 | 3,138 |  |  |  | $ 3,155
Exercise of stock options (in shares) | 109,500 |  |  |  |  | 110,000
Stock option vesting |  | 4,651 |  |  |  | $ 4,651
Cash distributions to joint venture partner |  |  |  |  | (1,229) | (1,229)
Cash dividends |  |  | (15,548) |  |  | (15,548)
Balances at Jan. 31, 2018 | $ 2,336 | $ 143,215 | $ 211,112 | $ 1,422 | $ 43 | $ 358,128
Balances (in shares) at Jan. 31, 2018 | 15,567,719 |  |  |  |  |

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