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Note 14 - Copyright Data Fees (Details Textual)
12 Months Ended
Apr. 30, 2017
USD ($)
Apr. 30, 2016
USD ($)
Apr. 30, 2015
USD ($)
Third Party Sponsored Assets for Copyright Data $ 3,600,000,000 $ 1,800,000,000  
Licenses Revenue $ 4,406,000 $ 2,621,000 $ 2,847,000
Percentage of Copyright Data Fees 68.00%    
Number of Contracts for Copyright Data 3 3