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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