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Schedule of Revenue Recognizes from Operating Lease Arrangements (Details) - USD ($)
$ in Thousands
 3 Months Ended
Jul. 31, 2024
Jul. 31, 2023
Product Information [Line Items]    
Revenue $ 1,301 $ 1,272
North And South America [Member]    
Product Information [Line Items]    
Revenue 1,230 1,254
Europe [Member]    
Product Information [Line Items]    
Revenue 71 18
Region [Member]    
Product Information [Line Items]    
Revenue 1,301 1,272
WAM-V [Member]    
Product Information [Line Items]    
Revenue 1,301 703
Buoy [Member]    
Product Information [Line Items]    
Revenue 250
Service [Member]    
Product Information [Line Items]    
Revenue 319
Product [Member]    
Product Information [Line Items]    
Revenue 1,301 1,272
Accounting Standards Update 2014-09 [Member] | North And South America [Member]    
Product Information [Line Items]    
Revenue 1,230 1,029
Accounting Standards Update 2014-09 [Member] | Europe [Member]    
Product Information [Line Items]    
Revenue 4
Accounting Standards Update 2014-09 [Member] | Region [Member]    
Product Information [Line Items]    
Revenue 1,234 1,029
Accounting Standards Update 2014-09 [Member] | WAM-V [Member]    
Product Information [Line Items]    
Revenue 1,234 460
Accounting Standards Update 2014-09 [Member] | Buoy [Member]    
Product Information [Line Items]    
Revenue 250
Accounting Standards Update 2014-09 [Member] | Service [Member]    
Product Information [Line Items]    
Revenue 319
Accounting Standards Update 2014-09 [Member] | Product [Member]    
Product Information [Line Items]    
Revenue 1,234 1,029
Accounting Standards Update 2016-02 [Member] | North And South America [Member]    
Product Information [Line Items]    
Revenue 225
Accounting Standards Update 2016-02 [Member] | Europe [Member]    
Product Information [Line Items]    
Revenue 67 18
Accounting Standards Update 2016-02 [Member] | Region [Member]    
Product Information [Line Items]    
Revenue 67 243
Accounting Standards Update 2016-02 [Member] | WAM-V [Member]    
Product Information [Line Items]    
Revenue 67 243
Accounting Standards Update 2016-02 [Member] | Buoy [Member]    
Product Information [Line Items]    
Revenue
Accounting Standards Update 2016-02 [Member] | Service [Member]    
Product Information [Line Items]    
Revenue
Accounting Standards Update 2016-02 [Member] | Product [Member]    
Product Information [Line Items]    
Revenue $ 67 $ 243