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Condensed Consolidated Statements of Equity (Unaudited) - USD ($)
shares in Thousands, $ 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 $ 361,987 $ (204,325) $ 100 $ 230,534
Issuance of common stock (in shares) 544          
Issuance of common stock 29 29
Stock options exercised (in shares) 131,357          
Stock options exercised $ 2 2,711 2,713
Purchase of treasury shares (7,377) (7,377)
Stock-based compensation 1,094 1,094
Dividends on subsidiary preferred stock (10) (10)
Net income 10,884 10,884
Balance (in shares) at Jul. 31, 2018 13,279,044          
Balance at Jul. 31, 2018 $ 133 76,475 372,861 (211,702) 100 237,867
Balance (in shares) at Apr. 30, 2018 13,147,143          
Balance at Apr. 30, 2018 $ 131 72,641 361,987 (204,325) 100 230,534
Net income           33,059
Balance (in shares) at Jan. 31, 2019 13,330,150          
Balance at Jan. 31, 2019 $ 133 78,839 395,017 (228,412) 100 245,677
Balance (in shares) at Jul. 31, 2018 13,279,044          
Balance at Jul. 31, 2018 $ 133 76,475 372,861 (211,702) 100 237,867
Issuance of common stock (in shares) 580          
Issuance of common stock 38 38
Stock options exercised (in shares) 46,776          
Stock options exercised 1,035 1,035
Purchase of treasury shares (6,495) (6,495)
Stock-based compensation 594 594
Dividends on subsidiary preferred stock (10) (10)
Net income 11,281 11,281
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
Issuance of common stock (in shares)          
Issuance of common stock 35 35
Stock options exercised (in shares) 3,750          
Stock options exercised $ 0 79 79
Purchase of treasury shares (10,215) (10,215)
Stock-based compensation 583 583
Dividends on subsidiary preferred stock (10) (10)
Net income 10,895 10,895
Balance (in shares) at Jan. 31, 2019 13,330,150          
Balance at Jan. 31, 2019 $ 133 78,839 395,017 (228,412) 100 245,677
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 40 40
Stock options exercised (in shares) 15,815          
Stock options exercised 80 80
Purchase of treasury shares (4,715) (4,715)
Stock-based compensation 1,620 1,620
Dividends on subsidiary preferred stock (10) (10)
Net income 15,511 15,511
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, 2019 13,376,030          
Balance at Apr. 30, 2019 $ 134 81,605 409,573 (230,902) 100 260,510
Net income           42,084
Balance (in shares) at Jan. 31, 2020 13,466,707          
Balance at Jan. 31, 2020 $ 135 86,633 451,627 (246,725) 100 291,770
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
Issuance of common stock (in shares) 631          
Issuance of common stock 50 50
Stock options exercised (in shares) 17,500          
Stock options exercised 785 785
Purchase of treasury shares (9,981) (9,981)
Stock-based compensation 592 592
Dividends on subsidiary preferred stock (10) (10)
Net income 13,887 13,887
Balance (in shares) at Oct. 31, 2019 13,410,528          
Balance at Oct. 31, 2019 $ 134 84,772 438,951 (245,598) 100 278,359
Issuance of common stock (in shares) 545          
Issuance of common stock 51 51
Stock options exercised (in shares) 55,634          
Stock options exercised $ 1 872 873
Purchase of treasury shares (1,127) (1,127)
Stock-based compensation 938 938
Dividends on subsidiary preferred stock (10) (10)
Net income 12,686 12,686
Balance (in shares) at Jan. 31, 2020 13,466,707          
Balance at Jan. 31, 2020 $ 135 $ 86,633 $ 451,627 $ (246,725) $ 100 $ 291,770