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Condensed Consolidated Statements of Equity (Unaudited) - 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, 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) 552          
Issuance of common stock $ 0 40 0 0 0 40
Stock options exercised (in shares) 15,815          
Stock options exercised $ 0 80 0 0 0 80
Stock based compensation 0 1,620 0 0 0 1,620
Dividends on subsidiary preferred stock 0 0 (10) 0 0 (10)
Net income 0 0 15,511 0 0 15,511
Purchase of treasury shares $ 0 0 0 (4,715) 0 (4,715)
Balance (in shares) at Jul. 31, 2019 13,392,397          
Balance at Jul. 31, 2019 $ 134 83,345 425,074 (235,617) 100 273,036
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
Issuance of common stock (in shares) 675          
Issuance of common stock $ 0 50 0 0 0 50
Stock options exercised (in shares) 22,000          
Stock options exercised $ 0 1,166 0 0 0 1,166
Stock based compensation 0 2,320 0 0 0 2,320
Dividends on subsidiary preferred stock 0 0 (10) 0 0 (10)
Net income $ 0 0 19,564 0 0 19,564
Balance (in shares) at Jul. 31, 2020 13,501,408          
Balance at Jul. 31, 2020 $ 135 $ 92,095 $ 480,430 $ (246,911) $ 100 $ 325,849