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Schedule of Right-of Use Assets and Lease Liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2022
Apr. 30, 2021
Leases    
Operating lease cost $ 368 $ 330
Short-term lease cost 35 17
Total lease cost 403 347
Operating right-of-use asset, net 752 1,036
Right-of-use liability- current 319 347
Right-of-use liability- long term 538 $ 819
Total lease liability $ 857  
Weighted average remaining lease term- operating leases 2 years 4 months 17 days  
Weighted average discount rate- operating leases 8.30%