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Note L - Correction of An Immaterial Error In Previously Issued Financial Statements - Correction of An Immaterial Error In Previously Issued Financial Statements (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Oct. 31, 2022
Jul. 31, 2022
Oct. 31, 2021
Jul. 31, 2021
Oct. 31, 2022
Oct. 31, 2021
Apr. 30, 2022
Apr. 30, 2021
Finance receivables, net $ 986,919   $ 764,070   $ 986,919 $ 764,070 $ 863,674 $ 632,270
Deferred income tax liabilities, net 35,620       35,620   30,449  
Retained earnings 682,226       682,226   665,410  
Sales 303,554 $ 294,476 247,520   598,031 491,423    
Provision for credit losses 88,828 76,241 56,491   165,068 106,341    
Provision for income taxes 919 4,027 6,780   4,946 13,902    
Net income 3,139 13,697 23,425 $ 26,054 16,836 49,479    
Net income attributable to common shareholders $ 3,129 $ 13,697 $ 23,415   $ 16,816 $ 49,459    
Basic (in dollars per share) $ 0.49 $ 2.15 $ 3.59   $ 2.64 $ 7.53    
Diluted (in dollars per share) $ 0.48 $ 2.07 $ 3.41   $ 2.56 $ 7.14    
Previously Reported [Member]                
Finance receivables, net             854,290  
Deferred income tax liabilities, net             28,233  
Retained earnings             658,242  
Sales   $ 300,540 $ 251,282     $ 498,025    
Provision for credit losses   82,903 60,947     115,055    
Provision for income taxes   3,884 6,618     13,409    
Net income   13,242 22,893     47,860    
Net income attributable to common shareholders   $ 13,242 $ 22,883     $ 47,840    
Basic (in dollars per share)   $ 2.08 $ 3.50     $ 7.28    
Diluted (in dollars per share)   $ 2.00 $ 3.33     $ 6.90    
Revision of Prior Period, Adjustment [Member]                
Finance receivables, net             9,384  
Deferred income tax liabilities, net             2,216  
Retained earnings             $ 7,168  
Sales   $ (6,064) $ (3,762)     $ (6,602)    
Provision for credit losses   (6,662) (4,456)     (8,714)    
Provision for income taxes   143 162     493    
Net income   455 532     1,619    
Net income attributable to common shareholders   $ 455 $ 532     $ 1,619    
Basic (in dollars per share)   $ 0.07 $ 0.09     $ 0.25    
Diluted (in dollars per share)   $ 0.07 $ 0.08     $ 0.24