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Note 14 - Copyright Fees (Details Textual) - USD ($)
12 Months Ended
Apr. 30, 2025
Apr. 30, 2024
Apr. 30, 2023
Revenue from Contract with Customer, Including Assessed Tax $ 35,079,000 $ 37,487,000 $ 39,695,000
Third Party Sponsored Assets for Copyright Data 9,010,000,000.00 9,640,000,000  
License [Member]      
Revenue from Contract with Customer, Including Assessed Tax $ 10,397,000 $ 12,067,000 $ 13,463,000
Percentage of Copyright Data Fees 13.80% 10.40% 0.60%