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Consolidated Statements 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, 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
Issuance of common stock (in shares) | 4,750 |  |  |  |  |
Issuance of common stock |  | 142 |  |  |  | $ 142
Stock options exercised (in shares) | 196,103 |  |  |  |  | 264,500
Stock options exercised | $ 2 | 1,895 |  |  |  | $ 1,897
Purchase of treasury shares |  |  |  | (20,489) |  | (20,489)
Tax benefit of stock based compensation |  | 1,183 |  |  |  | 1,183
Stock based compensation |  | 1,293 |  |  |  | 1,293
Dividends on subsidiary preferred stock |  |  | (40) |  |  | (40)
Net income |  |  | 20,205 |  |  | 20,205
Balance (in shares) at Apr. 30, 2017 | 12,927,413 |  |  |  |  |
Balance at Apr. 30, 2017 | $ 129 | 69,284 | 325,519 | (162,024) | 100 | 233,008
Issuance of common stock (in shares) | 3,096 |  |  |  |  |
Issuance of common stock |  | 115 |  |  |  | $ 115
Stock options exercised (in shares) | 216,634 |  |  |  |  | 323,000
Stock options exercised | $ 2 | 1,639 |  |  |  | $ 1,641
Purchase of treasury shares |  |  |  | (42,301) |  | (42,301)
Stock based compensation |  | 1,603 |  |  |  | 1,603
Dividends on subsidiary preferred stock |  |  | (40) |  |  | (40)
Net income |  |  | 36,509 |  |  | 36,509
Balance (in shares) at Apr. 30, 2018 | 13,147,143 |  |  |  |  |
Balance at Apr. 30, 2018 | $ 131 | $ 72,641 | $ 361,988 | $ (204,325) | $ 100 | $ 230,535

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