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Consolidated Statement of Equity (USD $) In Thousands, except Share data | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Treasury Stock [Member] | Noncontrolling Interest [Member] | Total
--- | --- | --- | --- | --- | --- | ---
Balance at April 30, 2010 at Apr. 30, 2010 | $ 123 | $ 43,483 | $ 150,012 | $ (17,528) | $ 100 | $ 176,190
Balance at April 30, 2010 (in Shares) at Apr. 30, 2010 | 12,268,807 |  |  |  |  |
Issuance of common stock |  | 103 |  |  |  | 103
Issuance of common stock (in Shares) | 4,851 |  |  |  |  |
Purchase of treasury shares |  |  |  | (20,347) |  | (20,347)
Tax benefit of restricted stock vested |  | 5 |  |  |  | 5
Stock based compensation |  | 2,885 |  |  |  | 2,885
Stock based compensation (in Shares) | 3,000 |  |  |  |  |
Dividends on subsidiary preferred stock |  |  | (40) |  |  | (40)
Net income |  |  | 28,215 |  |  | 28,215
Balance at Apr. 30, 2011 | 123 | 46,476 | 178,187 | (37,875) | 100 | 187,011
Balance (in Shares) at Apr. 30, 2011 | 12,276,658 |  |  |  |  |
Issuance of common stock |  | 118 |  |  |  | 118
Issuance of common stock (in Shares) | 3,862 |  |  |  |  |
Stock options exercised | 1 | 1,370 |  |  |  | 1,371
Stock options exercised (in Shares) | 88,647 |  |  |  |  | 88,647
Purchase of treasury shares |  |  |  | (39,367) |  | (39,367)
Tax benefit of restricted stock vested |  | 221 |  |  |  | 221
Stock based compensation |  | 2,172 |  |  |  | 2,172
Stock based compensation (in Shares) | 2,000 |  |  |  |  |
Dividends on subsidiary preferred stock |  |  | (40) |  |  | (40)
Net income |  |  | 32,987 |  |  | 32,987
Balance at Apr. 30, 2012 | 124 | 50,357 | 211,134 | (77,242) | 100 | 184,473
Balance (in Shares) at Apr. 30, 2012 | 12,371,167 |  |  |  |  |
Issuance of common stock |  | 143 |  |  |  | 143
Issuance of common stock (in Shares) | 4,242 |  |  |  |  |
Stock options exercised |  | 790 |  |  |  | 790
Stock options exercised (in Shares) | 35,750 |  |  |  |  | 35,750
Purchase of treasury shares |  |  |  | (17,305) |  | (17,305)
Tax benefit of restricted stock vested |  | 190 |  |  |  | 190
Stock based compensation |  | 1,852 |  |  |  | 1,852
Stock based compensation (in Shares) | 3,500 |  |  |  |  |
Dividends on subsidiary preferred stock |  |  | (40) |  |  | (40)
Net income |  |  | 32,165 |  |  | 32,165
Balance at Apr. 30, 2013 | $ 124 | $ 53,332 | $ 243,259 | $ (94,547) | $ 100 | $ 202,268
Balance (in Shares) at Apr. 30, 2013 | 12,414,659 |  |  |  |  |

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