Schedule of Revenue Recognizes From Operating Lease Arrangements (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2024	Jan. 31, 2023	Jan. 31, 2024	Jan. 31, 2023
Product Information [Line Items]
Revenue	$ 1,792	$ 734	$ 3,953	$ 1,752
North And South America [Member]
Product Information [Line Items]
Revenue	1,792	715	3,953	1,501
Asia and Australia [Member]
Product Information [Line Items]
Revenue		19		251
Region [Member]
Product Information [Line Items]
Revenue	1,792	734	3,953	1,752
WAMV [Member]
Product Information [Line Items]
Revenue	1,472	446	2,521	881
Buoy [Member]
Product Information [Line Items]
Revenue	320	176	950	227
Service [Member]
Product Information [Line Items]
Revenue		112	482	644
Product [Member]
Product Information [Line Items]
Revenue	1,792	734	3,953	1,752
Accounting Standards Update 2014-09 [Member] \| North And South America [Member]
Product Information [Line Items]
Revenue	1,405	540	3,057	1,311
Accounting Standards Update 2014-09 [Member] \| Asia and Australia [Member]
Product Information [Line Items]
Revenue		19		251
Accounting Standards Update 2014-09 [Member] \| Region [Member]
Product Information [Line Items]
Revenue	1,405	559	3,057	1,562
Accounting Standards Update 2014-09 [Member] \| WAMV [Member]
Product Information [Line Items]
Revenue	1,085	271	1,625	691
Accounting Standards Update 2014-09 [Member] \| Buoy [Member]
Product Information [Line Items]
Revenue	320	176	950	227
Accounting Standards Update 2014-09 [Member] \| Service [Member]
Product Information [Line Items]
Revenue		112	482	644
Accounting Standards Update 2014-09 [Member] \| Product [Member]
Product Information [Line Items]
Revenue	1,405	559	3,057	1,562
Accounting Standards Update 2016-02 [Member] \| North And South America [Member]
Product Information [Line Items]
Revenue	387	175	896	190
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	387	175	896	190
Accounting Standards Update 2016-02 [Member] \| WAMV [Member]
Product Information [Line Items]
Revenue	387	175	896	190
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	$ 387	$ 175	$ 896	$ 190