Quarterly report pursuant to Section 13 or 15(d)

Operating leases (Details)

v3.22.0.1
Operating leases (Details)
 9 Months Ended
Jan. 31, 2022
USD ($)
Operating Lease Location 1 [Member]  
Operating Lease, Expense $ 22,000
Operating Lease Location 2 [Member]  
Operating Lease, Expense 4,600
Operating Lease Location 3 [Member]  
Operating Lease, Expense 3,438
Operating Lease Location 4 [Member]  
Operating Lease, Expense 2,667
Operating Lease Location 5 [Member]  
Operating Lease, Expense $ 1,690