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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
Oct. 31, 2024
Apr. 30, 2024
Assets $ 139,992 $ 136,035
Liabilities 43,277 45,242
EAM Trust [Member]    
Assets 63,953 63,076
Liabilities 6,861 5,881
EAM Trust [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]    
Assets 60,786 60,134
Liabilities 0 0
Value Line Maximum Exposure to Loss $ 60,786 $ 60,134