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Note 14 - Copyright Data Fees (Details Textual)
12 Months Ended
Apr. 30, 2016
USD ($)
Apr. 30, 2015
USD ($)
Apr. 30, 2014
USD ($)
Licenses Revenue $ 2,621,000 $ 2,847,000 $ 2,733,000
Percentage of Copyright Data Fees 7.90%    
Number of Contracts for Copyright Data 3 4  
Third Party Sponsored Assets for Copyright Data $ 1,800,000,000 $ 2,300,000,000