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Schedule of Revenue Recognizes From Operating Lease Arrangements (Details) - USD ($)
$ in Thousands
 3 Months Ended
Jul. 31, 2023
Jul. 31, 2022
Product Information [Line Items]    
Revenue $ 1,272 $ 714
North And South America [Member]    
Product Information [Line Items]    
Revenue 1,272 536
Asia and Australia [Member]    
Product Information [Line Items]    
Revenue 178
Region [Member]    
Product Information [Line Items]    
Revenue 1,272 714
WAMV [Member]    
Product Information [Line Items]    
Revenue 703 337
Buoy [Member]    
Product Information [Line Items]    
Revenue 250 12
Service [Member]    
Product Information [Line Items]    
Revenue 319 365
Product [Member]    
Product Information [Line Items]    
Revenue 1,272 714
Accounting Standards Update 2014-09 [Member] | North And South America [Member]    
Product Information [Line Items]    
Revenue 1,029 522
Accounting Standards Update 2014-09 [Member] | Asia and Australia [Member]    
Product Information [Line Items]    
Revenue 178
Accounting Standards Update 2014-09 [Member] | Region [Member]    
Product Information [Line Items]    
Revenue 1,029 700
Accounting Standards Update 2014-09 [Member] | WAMV [Member]    
Product Information [Line Items]    
Revenue 460 323
Accounting Standards Update 2014-09 [Member] | Buoy [Member]    
Product Information [Line Items]    
Revenue 250 12
Accounting Standards Update 2014-09 [Member] | Service [Member]    
Product Information [Line Items]    
Revenue 319 365
Accounting Standards Update 2014-09 [Member] | Product [Member]    
Product Information [Line Items]    
Revenue 1,029 700
Accounting Standards Update 2016-02 [Member] | North And South America [Member]    
Product Information [Line Items]    
Revenue 243 14
Accounting Standards Update 2016-02 [Member] | Asia and Australia [Member]    
Product Information [Line Items]    
Revenue
Accounting Standards Update 2016-02 [Member] | Region [Member]    
Product Information [Line Items]    
Revenue 243 14
Accounting Standards Update 2016-02 [Member] | WAMV [Member]    
Product Information [Line Items]    
Revenue 243 14
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 $ 243 $ 14