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Leases - Lease Rental Receivables (Details) - USD ($)
$ in Thousands
Jul. 31, 2019
Apr. 30, 2019
Lease Payments to be Received    
FY2020 $ 143  
FY2021 105  
FY2022 55  
FY2023 0  
FY2024 0  
Total $ 303  
Future Minimum Lease Rental Receivables    
2020   $ 194
2021   105
2022   55
2023   0
2024   0
Thereafter   0
Total   $ 354