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Note 4 - Investments (Details Textual) - USD ($)
 12 Months Ended
Apr. 30, 2023
Apr. 30, 2022
Apr. 30, 2021
Equity Securities, FV-NI, Cost $ 10,169,000 $ 13,318,000  
Equity Securities, FV-NI 14,546,000 17,647,000  
Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, Net of Tax, Portion Attributable to Parent 398,000 (27,000) $ (128,000)
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax 105,000 (7,000) (45,000)
Proceeds from Sale of Equity Securities, FV-NI 4,706,000 12,039,000 $ 8,212,000
Equity Securities, FV-NI, Gain (Loss) (174,000) (1,254,000)  
Equity Method Investments 58,775,000 59,971,000  
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 $ 2,601,000 3,657,000  
Fixed Income Securities [Member]      
Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale, Total 9,907,000 2,496,000  
AOCI, Debt Securities, Available-for-Sale, Adjustment, after Tax 473,000 30,000  
Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, Net of Tax, Portion Attributable to Parent 503,000 (34,000)  
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax $ 105,000 $ (7,000)  
Debt Securities, Available-for-Sale, Weighted Average Yield 2.55% 0.60%  
Fixed Income Securities [Member] | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]      
AOCI Tax, Attributable to Parent $ 99,000 $ 6,000