Schedule of Revenue Recognized Under ASC 606 and ASC 842 (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2025	Oct. 31, 2024	Oct. 31, 2025	Oct. 31, 2024
Product Information [Line Items]
Revenue	$ 424	$ 2,418	$ 1,606	$ 3,719
North and South America [Member]
Product Information [Line Items]
Revenue	137	1,491	272	2,720
EMEA [Member]
Product Information [Line Items]
Revenue	111	925
Asia and Australia [Member]
Product Information [Line Items]
Revenue	176	2	177	2
Region [Member]
Product Information [Line Items]
Revenue	424	2,418	1,606	3,719
Europe [Member]
Product Information [Line Items]
Revenue			1,157	997
WAM-V [Member]
Product Information [Line Items]
Revenue	169	2,247	1,274	3,548
Buoy [Member]
Product Information [Line Items]
Revenue	255	171	321	171
Service [Member]
Product Information [Line Items]
Revenue			11
Product [Member]
Product Information [Line Items]
Revenue	424	2,418	1,606	3,719
Accounting Standards Update 2014-09 [Member] \| North and South America [Member]
Product Information [Line Items]
Revenue	137	1,491	272	2,720
Accounting Standards Update 2014-09 [Member] \| EMEA [Member]
Product Information [Line Items]
Revenue	43	860
Accounting Standards Update 2014-09 [Member] \| Asia and Australia [Member]
Product Information [Line Items]
Revenue	176	2	177	2
Accounting Standards Update 2014-09 [Member] \| Region [Member]
Product Information [Line Items]
Revenue	356	2,353	1,471	3,587
Accounting Standards Update 2014-09 [Member] \| Europe [Member]
Product Information [Line Items]
Revenue			1,022	865
Accounting Standards Update 2014-09 [Member] \| WAM-V [Member]
Product Information [Line Items]
Revenue	101	2,182	1,139	3,416
Accounting Standards Update 2014-09 [Member] \| Buoy [Member]
Product Information [Line Items]
Revenue	255	171	321	171
Accounting Standards Update 2014-09 [Member] \| Service [Member]
Product Information [Line Items]
Revenue			11
Accounting Standards Update 2014-09 [Member] \| Product [Member]
Product Information [Line Items]
Revenue	356	2,353	1,471	3,587
Accounting Standards Update 2016-02 [Member] \| North and South America [Member]
Product Information [Line Items]
Revenue
Accounting Standards Update 2016-02 [Member] \| EMEA [Member]
Product Information [Line Items]
Revenue	68	65
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	68	65	135	132
Accounting Standards Update 2016-02 [Member] \| Europe [Member]
Product Information [Line Items]
Revenue			135	132
Accounting Standards Update 2016-02 [Member] \| WAM-V [Member]
Product Information [Line Items]
Revenue	68	65	135	132
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	$ 68	$ 65	$ 135	$ 132