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Note L - Correction of An Immaterial Error In Previously Issued Financial Statements - Correction of An Immaterial Error (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Jul. 31, 2023
Jul. 31, 2022
Sales $ 311,569 $ 294,476
Provision for credit losses 96,323 76,241
Provision for income taxes 1,034 4,027
Net income 4,186 13,697
Net income attributable to common shareholders $ 4,176 $ 13,687
Basic (in dollars per share) $ 0.65 $ 2.15
Diluted (in dollars per share) $ 0.63 $ 2.07
Previously Reported [Member]    
Sales   $ 300,540
Provision for credit losses   82,903
Provision for income taxes   3,884
Net income   13,242
Net income attributable to common shareholders   $ 13,232
Basic (in dollars per share)   $ 2.08
Diluted (in dollars per share)   $ 2.00
Revision of Prior Period, Adjustment [Member]    
Sales   $ (6,064)
Provision for credit losses   (6,662)
Provision for income taxes   143
Net income   455
Net income attributable to common shareholders   $ 455
Basic (in dollars per share)   $ 0.07
Diluted (in dollars per share)   $ 0.07