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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