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Note 14 - Copyright Fees (Details Textual) - USD ($)
 12 Months Ended
Apr. 30, 2023
Apr. 30, 2022
Apr. 30, 2021
Revenue from Contract with Customer, Including Assessed Tax $ 39,695,000 $ 40,525,000 $ 40,392,000
Third Party Sponsored Assets for Copyright Data 12,390,000,000 12,450,000,000  
License [Member]      
Revenue from Contract with Customer, Including Assessed Tax $ 13,463,000 $ 13,380,000 $ 12,763,000
Percentage of Copyright Data Fees 0.60% 4.80% 0.70%