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		Jul. 31, 2024	Apr. 30, 2024
Assets		$ 138,557	$ 136,035
Liabilities		44,704	45,242
EAM Trust [Member]
Assets		63,126	63,076
Liabilities	[1]	6,182	5,881
EAM Trust [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Assets	[2]	60,371	60,134
Liabilities		0	0
Value Line Maximum Exposure to Loss		$ 60,371	$ 60,134

[1] At July 31, 2024 and April 30, 2024, EAM's total liabilities included a payable to VLI for its accrued non-voting revenues interest and non-voting profits interest of $4,215,000 and $3,865,000, respectively.

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