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Schedule of Components of Property and Equipment (Details) - USD ($) $ in Thousands	Apr. 30, 2023	Apr. 30, 2022
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 2,851	$ 2,030
Less: accumulated depreciation	(1,571)	(1,585)
Property and equipment, net	1,280	445
Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	783	615
Computer Equipment & Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	700	571
Office Furniture And Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	386	352
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	611	477
Leased buoys And WAMVs [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	371
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross		$ 15

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- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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