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Note 7 - Commitments and Contingencies (Tables)
12 Months Ended
Apr. 30, 2017
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Year Ending April 30
 
Amount
 
2018
 
$
5,016
 
2019
 
 
4,929
 
2020
 
 
4,946
 
2021
 
 
4,995
 
2022
 
 
5,037
 
 
 
$
24,9
23