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Condensed Consolidated Statements of Equity (Current Period Unaudited) - 6 months ended Oct. 31, 2018 - 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, 2018 | 13,147,143 |  |  |  |  |
Balance at Apr. 30, 2018 | $ 131 | $ 72,641 | $ 361,988 | $ (204,325) | $ 100 | $ 230,535
Issuance of common stock (in shares) | 1,124 |  |  |  |  |
Issuance of common stock |  | 67 |  |  |  | 67
Stock options exercised (in shares) | 178,133 |  |  |  |  |
Stock options exercised | $ 2 | 3,746 |  |  |  | 3,748
Purchase of 89,656 treasury shares |  |  |  | (13,872) |  | (13,872)
Stock based compensation |  | 1,688 |  |  |  | 1,688
Dividends on subsidiary preferred stock |  |  | (20) |  |  | (20)
Net income |  |  | 22,164 |  |  | 22,164
Balance (in shares) at Oct. 31, 2018 | 13,326,400 |  |  |  |  |
Balance at Oct. 31, 2018 | $ 133 | $ 78,142 | $ 384,132 | $ (218,197) | $ 100 | $ 244,310

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