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Note 4 - Investments (Details Textual) - USD ($)
 12 Months Ended
Apr. 30, 2025
Apr. 30, 2024
Apr. 30, 2023
Equity Securities, FV-NI, Cost $ 15,513,000 $ 11,663,000  
Equity securities 20,879,000 16,344,000  
Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, Net of Tax, Portion Attributable to Parent 187,000 (627,000) $ 398,000
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax 50,000 (166,000) 105,000
Proceeds from Sale of Equity Securities, FV-NI 3,243,000 1,129,000 $ 4,706,000
Equity Securities, FV-NI, Gain (Loss) (126,000) (16,000)  
Equity Method Investments 60,807,000 60,134,000  
EAM Trust [Member]      
Fair Value of Contributed Capital at Inception 55,805,000 55,805,000  
Cash and Liquid Securities in Excess of Working Capital Requirements Contributed to Capital Account 5,820,000 5,820,000  
Equity Method Investment, Other-than-Temporary Impairment $ 0 0  
Percentage of Non Voting Profit Interest 50.00%    
Accrued Non Voting Revenues and Non Voting Profits Interests Payable $ 4,493,000 3,865,000  
Fixed Income Securities [Member]      
Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale 43,477,000 37,114,000  
AOCI, Debt Securities, Available-for-Sale, Adjustment, after Tax 83,000 320,000  
Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, Net of Tax, Portion Attributable to Parent 237,000 (793,000)  
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax $ 50,000 $ (166,000)  
Debt Securities, Available-for-Sale, Weighted Average Yield 5.99% 4.40%  
Fixed Income Securities [Member] | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]      
AOCI Tax, Attributable to Parent $ 17,000 $ 67,000