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Summary of Significant Accounting Policies (Tables)

6 Months Ended

Oct. 31, 2023

Accounting Policies [Abstract]

Schedule of Cash and Cash Equivalents and Restricted Cash

The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the Consolidated Balance Sheets that total to the same amounts shown in the Consolidated Statements of Cash Flows.

Schedule of Cash and Cash Equivalents and Restricted Cash

		October 31, 2023				April 30, 2023
		(in thousands)
Cash and cash equivalents		$	3,292			$	6,883
Restricted cash- short term			219				65
Restricted cash- long term			—				155
Cash, cash equivalents, restricted cash and restricted cash equivalents		$	3,511			$	7,103

Schedule of Investments and Unrealized Gains/Losses

The following table summarizes the Company’s short term investments as of October 31, 2023 and April 30, 2023:

Schedule of Investments and Unrealized Gains/Losses

		October 31, 2023												April 30, 2023
Category		Amortized Cost				Unrealized Gains				Market Value				Amortized Cost				Unrealized Gains				Market Value
		(in thousands)												(in thousands)
Corporate Bonds		$	6,911			$	56			$	6,967			$	14,776			$	100			$	14,876
Government Bonds & Notes			6,692			$	35				6,727				9,188			$	33				9,221
Government Agency Bonds			1,824			$	23				1,847				3,826				25				3,851
Total Short Term Investments		$	15,427			$	114			$	15,541			$	27,790			$	158			$	27,948

Schedule of Property, Plant and Equipment, Useful Life

Schedule of Property, Plant and Equipment, Useful Life

Description		Estimated depreciable life
Equipment		5-7 years
Computer equipment & software		3 years
Office furniture & fixtures		3-7 years
Leasehold improvements		Shorter of the estimated useful life or lease term
Leased Power Buoys assets		10 years
Leased WAM-V assets		10 years

Schedule of Revenue Recognizes From Operating Lease Arrangements

The below table represents the total revenue recognized under ASC 606 and ASC 842 for the three and six months ended October 31, 2023 and 2022.

Schedule of Revenue Recognizes From Operating Lease Arrangements

		Six months ended October 31, 2023												Six months ended October 31, 2022
		ASC 606				ASC 842				Total				ASC 606				ASC 842				Total
		(in thousands)												(in thousands)
Product Line:
WAM-V		$	540			$	509			$	1,049			$	420			$	15			$	435
Buoy			630				—				630				50				—				50
Services			482				—				482				532				—				532
Total		$	1,652			$	509			$	2,161			$	1,002			$	15			$	1,017
Region:
North and South America		$	1,652			$	509			$	2,161			$	770			$	15			$	785
Asia and Australia			—				—				—				232				—				232
Total		$	1,652			$	509			$	2,161			$	1,002			$	15			$	1,017

		Three months ended October 31, 2023												Three months ended October 31, 2022
		ASC 606				ASC 842				Total				ASC 606				ASC 842				Total
		(in thousands)												(in thousands)
Product Line:
WAM-V		$	81			$	266			$	347			$	98			$	—			$	98
Buoy			380				—				380				38				—				38
Services			162				—				162				167				—				167
Total		$	623			$	266			$	889			$	303			$	—			$	303
Region:
North and South America		$	623			$	266			$	889			$	249			$	—			$	249
Asia and Australia			—				—				—				54				—				54
Total		$	623			$	266			$	889			$	303			$	—			$	303

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