Note C - Finance Receivables, Net - Finance Receivable Summarized by Fiscal Year of Origination (Details) - USD ($) $ in Thousands	Oct. 31, 2020	Apr. 30, 2020	Oct. 31, 2019
Principal balance	$ 692,775	$ 621,182	$ 587,087
Financing Receivable Originated in 2021 [Member]
Principal balance	300,859
Financing Receivable Originated in 2020 [Member]
Principal balance	304,214
Financing Receivable Originated in 2019 [Member]
Principal balance	75,570
Financing Receivable Originated in 2018 [Member]
Principal balance	10,020
Financing Receivable Originated in 2017 [Member]
Principal balance	1,427
Financing Receivable Originated Prior to 2017 [Member]
Principal balance	$ 685