Note 3 - Variable Interest Entity - Total Assets, the Maximum Exposure to Loss, and Value of the Assets and Liabilities in EAM (Details) - USD ($) $ in Thousands		Jan. 31, 2024	Apr. 30, 2023
Assets		$ 134,541	$ 131,076
Liabilities		45,295	47,403
EAM Trust [Member]
Assets		62,610	61,389
Liabilities	[1]	5,532	4,357
EAM Trust [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Assets	[2]	59,640	58,775
Liabilities		0	0
Value Line Maximum Exposure to Loss		$ 59,640	$ 58,775

[1] At July 31, 2023 and April 30, 2023, EAM's total liabilities included a payable to VLI for its accrued non-voting revenues interest and non-voting profits interest of $2,833,000 and $2,601,000, respectively.

[2] Reported within Long-Term Assets on the Consolidated Condensed Balance Sheets.