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Consolidated Statements 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, 2017 12,927,413          
Balance at Apr. 30, 2017 $ 129 $ 69,284 $ 325,519 $ (162,024) $ 100 $ 233,008
Issuance of common stock (in shares) 3,096          
Issuance of common stock 115 $ 115
Stock options exercised (in shares) 216,634         323,000
Stock options exercised $ 2 1,639 $ 1,641
Purchase of treasury shares (42,301) (42,301)
Stock based compensation 1,603 1,603
Dividends on subsidiary preferred stock (40) (40)
Net income 36,509 36,509
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) 2,267          
Issuance of common stock 147 $ 147
Stock options exercised (in shares) 226,620         275,000
Stock options exercised $ 3 5,114 $ 5,117
Purchase of treasury shares (26,577) (26,577)
Stock based compensation 3,703 3,703
Dividends on subsidiary preferred stock (40) (40)
Net income 47,625 47,625
Balance (in shares) at Apr. 30, 2019 13,376,030          
Balance at Apr. 30, 2019 $ 134 81,605 409,573 (230,902) 100 260,510
Issuance of common stock (in shares) 9,760          
Issuance of common stock 190 $ 190
Stock options exercised (in shares) 92,943         121,250
Stock options exercised $ 1 1,532 $ 1,533
Purchase of treasury shares (16,009) (16,009)
Stock based compensation 4,732 4,732
Dividends on subsidiary preferred stock (40) (40)
Net income 51,343 51,343
Issuance of restricted stock 500 500
Balance (in shares) at Apr. 30, 2020 13,478,733          
Balance at Apr. 30, 2020 $ 135 $ 88,559 $ 460,876 $ (246,911) $ 100 $ 302,759