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Schedule of Revenue by Major Customers by Reporting Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended
Jul. 31, 2021
Jul. 31, 2020
Product Information [Line Items]    
Revenues $ 272 $ 169
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Eni S.p.A [Member]    
Product Information [Line Items]    
Revenues 28
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Harbour [Member]    
Product Information [Line Items]    
Revenues 27
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | EGP [Member]    
Product Information [Line Items]    
Revenues 149 114
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Valaris [Member]    
Product Information [Line Items]    
Revenues 89
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Other [Member]    
Product Information [Line Items]    
Revenues 34
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Total Customer [Member]    
Product Information [Line Items]    
Revenues $ 272 $ 169