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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, 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   50       50
Stock options exercised (in shares) 22,000          
Stock options exercised   1,166       1,166
Stock based compensation   2,320       2,320
Dividends on subsidiary preferred stock     (10)     (10)
Net income     19,564     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
Balance (in shares) at Apr. 30, 2021 13,591,889          
Balance at Apr. 30, 2021 $ 136 98,812 564,975 (257,527) 100 406,496
Issuance of common stock (in shares) 673          
Issuance of common stock   81       81
Stock options exercised (in shares) 15,281          
Stock options exercised   (1,007)       (1,007)
Purchase of 81,742 treasury shares       (11,618)   (11,618)
Stock based compensation   2,972       2,972
Dividends on subsidiary preferred stock     (10)     (10)
Net income     24,967     24,967
Balance (in shares) at Jul. 31, 2021 13,607,843          
Balance at Jul. 31, 2021 $ 136 $ 100,858 $ 589,932 $ (269,145) $ 100 $ 421,881