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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