Schedule of Revenue Recognized Under ASC 606 and ASC 842 (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2025	Jan. 31, 2024	Jan. 31, 2025	Jan. 31, 2024
Product Information [Line Items]
Revenue	$ 825	$ 1,792	$ 4,545	$ 3,953
North and South America [Member]
Product Information [Line Items]
Revenue	326	1,729	3,046	3,775
EMEA [Member]
Product Information [Line Items]
Revenue	499	63	1,497	178
Asia and Australia [Member]
Product Information [Line Items]
Revenue			2
Region [Member]
Product Information [Line Items]
Revenue	825	1,792	4,545	3,953
WAM-V [Member]
Product Information [Line Items]
Revenue	654	1,472	4,202	2,521
Buoy [Member]
Product Information [Line Items]
Revenue	171	320	343	950
Service [Member]
Product Information [Line Items]
Revenue				482
Product [Member]
Product Information [Line Items]
Revenue	825	1,792	4,545	3,953
Accounting Standards Update 2014-09 [Member] \| North and South America [Member]
Product Information [Line Items]
Revenue	326	1,391	3,046	3,025
Accounting Standards Update 2014-09 [Member] \| EMEA [Member]
Product Information [Line Items]
Revenue	425	14	1,291	32
Accounting Standards Update 2014-09 [Member] \| Asia and Australia [Member]
Product Information [Line Items]
Revenue			2
Accounting Standards Update 2014-09 [Member] \| Region [Member]
Product Information [Line Items]
Revenue	751	1,405	4,339	3,057
Accounting Standards Update 2014-09 [Member] \| WAM-V [Member]
Product Information [Line Items]
Revenue	580	1,085	3,996	1,625
Accounting Standards Update 2014-09 [Member] \| Buoy [Member]
Product Information [Line Items]
Revenue	171	320	343	950
Accounting Standards Update 2014-09 [Member] \| Service [Member]
Product Information [Line Items]
Revenue				482
Accounting Standards Update 2014-09 [Member] \| Product [Member]
Product Information [Line Items]
Revenue	751	1,405	4,339	3,057
Accounting Standards Update 2016-02 [Member] \| North and South America [Member]
Product Information [Line Items]
Revenue		338		750
Accounting Standards Update 2016-02 [Member] \| EMEA [Member]
Product Information [Line Items]
Revenue	74	49	206	146
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	74	387	206	896
Accounting Standards Update 2016-02 [Member] \| WAM-V [Member]
Product Information [Line Items]
Revenue	74	387	206	896
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	$ 74	$ 387	$ 206	$ 896