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Note 7 - Commitments and Contingencies (Tables)
12 Months Ended
Apr. 30, 2018
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Year Ending April 30
 
 
 
 
 
Amount
 
2019
          $
4,929
 
2020
           
4,946
 
2021
           
4,995
 
2022
           
5,037
 
2023
           
5,088
 
            $
24,995