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Note 8 - Commitments and Contingencies (Tables)
12 Months Ended
Apr. 30, 2019
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Year Ending April 30
   
Amount
 
2020
    $
4,890
 
2021
     
4,938
 
2022
     
4,987
 
2023
     
5,037
 
2024
     
5,088
 
      $
24,940