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Summary of Significant Accounting Policies (Tables)

12 Months Ended

Apr. 30, 2022

Accounting Policies [Abstract]

Schedule of Cash and Cash Equivalents

Schedule of Cash and Cash Equivalents

		April 30, 2022				April 30, 2021
		(in thousands)
Checking and savings accounts		$	1,815			$	1,850
Money market account			6,070				81,178
		$	7,885			$	83,028

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 

		April 30, 2022				April 30, 2021
		(in thousands)
Cash and cash equivalents		$	7,885			$	83,028
Restricted cash- short term			258				384
Restricted cash- long term			219				222
Cash, cash equivalents, restricted cash and restricted cash equivalents		$	8,362			$	83,634

Schedule of Investments and Unrealized Gains/Losses

The following table represents the fair value of the investments and unrealized gains/losses by class, which have been recorded at amortized costs as of April 30, 2022:

Schedule of Investments and Unrealized Gains/Losses

Category		Cost or Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses				Estimated Fair Value				Net Unrealized Gains/(Losses)
Held-to-Maturity Securities		$	49,384			$	81			$	(414	)		$	49,051			$	(333	)

Schedule of Property, Plant and Equipment, Useful Life

Schedule of Property, Plant and Equipment, Useful Life

Description		Estimated useful life
Equipment		5-7 years
Computer equipment & software		3 years
Office furniture & fixtures		3-7 years
Equipment under capitalized lease		Over the life of the lease
Leasehold improvements		Shorter of the estimated useful life or lease term

Schedule of Revenue by Major Customers by Reporting Segments

The table below shows the percentage of the Company’s revenues derived from customers whose revenues accounted for at least 10% of the Company’s consolidated revenues for at least one of the periods indicated:

 Schedule of Revenue by Major Customers by Reporting Segments

Customer		2022				2021
		Twelve months ended April 30,
Customer		2022				2021
Transocean Ltd.			15	%			—	%
Valaris PLC			12	%			—	%
Diamond Offshore Drilling, Inc.			11	%			—	%
United States Department of Energy			11	%			—	%
Enel Green Power Chile, LTDA			9	%			61	%
Eni S.p.A.			1	%			22	%
Other (no other customers over 10%)			41	%			17	%
Revenues, percentage			100	%			100	%

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