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Note C - Finance Receivables, Net - Credit Quality Information for Finance Receivables (Details) - USD ($) $ in Thousands	Jul. 31, 2021	Apr. 30, 2021	Jul. 31, 2020
Principle Balance	$ 890,467	$ 809,537	$ 643,335
Percent of Portfolio	100.00%	100.00%	100.00%
Financial Asset, Not Past Due [Member]
Principle Balance	$ 767,375	$ 717,520	$ 559,168
Percent of Portfolio	86.18%	88.64%	86.92%
Financial Asset, 3 to 29 Days Past Due [Member]
Principle Balance	$ 93,712	$ 71,269	$ 67,361
Percent of Portfolio	10.53%	8.80%	10.47%
Financial Asset, 30 to 59 Days Past Due [Member]
Principle Balance	$ 19,328	$ 13,058	$ 11,526
Percent of Portfolio	2.17%	1.61%	1.79%
Financial Asset, 60 to 89 Days Past Due [Member]
Principle Balance	$ 6,096	$ 5,551	$ 3,028
Percent of Portfolio	0.68%	0.69%	0.47%
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Principle Balance	$ 3,956	$ 2,139	$ 2,252
Percent of Portfolio	0.44%	0.26%	0.35%