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Consolidated Statement of Equity - USD ($) $ in Thousands | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Treasury Stock [Member] | Noncontrolling Interest [Member] | Total
--- | --- | --- | --- | --- | --- | ---
Balance (in shares) at Apr. 30, 2013 | 12,414,659 |  |  |  |  |
Balance at Apr. 30, 2013 | $ 124 | $ 53,332 | $ 243,259 | $ (94,547) | $ 100 | $ 202,268
Issuance of common stock (in shares) | 4,150 |  |  |  |  |
Issuance of common stock |  | 151 |  |  |  | $ 151
Stock options exercised (in shares) | 30,500 |  |  |  |  | 30,500
Stock options exercised | $ 1 | 719 |  |  |  | $ 720
Purchase of treasury shares |  |  |  | (12,754) |  | (12,754)
Tax benefit of stock based compensation |  | 141 |  |  |  | 141
Stock based compensation (in shares) | 3,500 |  |  |  |  |
Stock based compensation |  | 1,391 |  |  |  | 1,391
Dividends on subsidiary preferred stock |  |  | (40) |  |  | (40)
Net income |  |  | 21,129 |  |  | 21,129
Balance (in shares) at Apr. 30, 2014 | 12,452,809 |  |  |  |  |
Balance at Apr. 30, 2014 | $ 125 | 55,734 | 264,348 | (107,301) | 100 | 213,006
Issuance of common stock (in shares) | 3,831 |  |  |  |  |
Issuance of common stock |  | 146 |  |  |  | $ 146
Stock options exercised (in shares) | 212,250 |  |  |  |  | 212,250
Stock options exercised | $ 2 | 4,141 |  |  |  | $ 4,143
Purchase of treasury shares |  |  |  | (20,020) |  | (20,020)
Tax benefit of stock based compensation |  | 1,627 |  |  |  | 1,627
Stock based compensation (in shares) | 20,000 |  |  |  |  |
Stock based compensation |  | 780 |  |  |  | 780
Dividends on subsidiary preferred stock |  |  | (40) |  |  | (40)
Net income |  |  | 29,490 |  |  | 29,490
Balance (in shares) at Apr. 30, 2015 | 12,688,890 |  |  |  |  |
Balance at Apr. 30, 2015 | $ 127 | 62,428 | 293,798 | (127,321) | 100 | 229,132
Issuance of common stock (in shares) | 6,920 |  |  |  |  |
Issuance of common stock |  | 186 |  |  |  | $ 186
Stock options exercised (in shares) | 30,750 |  |  |  |  | 30,750
Stock options exercised |  | 400 |  |  |  | $ 400
Purchase of treasury shares |  |  |  | (14,214) |  | (14,214)
Tax benefit of stock based compensation |  | 238 |  |  |  | 238
Stock based compensation |  | 1,519 |  |  |  | 1,519
Dividends on subsidiary preferred stock |  |  | (40) |  |  | (40)
Net income |  |  | 11,596 |  |  | 11,596
Balance (in shares) at Apr. 30, 2016 | 12,726,560 |  |  |  |  |
Balance at Apr. 30, 2016 | $ 127 | $ 64,771 | $ 305,354 | $ (141,535) | $ 100 | $ 228,817

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