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Summary of Significant Accounting Policies (Tables)

6 Months Ended

Oct. 31, 2021

Accounting Policies [Abstract]

Schedule of Cash and Cash Equivalents

Schedule of Cash and Cash Equivalents

		October 31, 2021				April 30, 2021
		(in thousands)
Checking and savings accounts		$	713			$	1,850
Money market account			71,917				81,178
		$	72,630			$	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

		October 31, 2021				April 30, 2021
		(in thousands)
Cash and cash equivalents		$	72,630			$	83,028
Restricted cash- short term			384				384
Restricted cash- long term			222				222
		$	73,236			$	83,634

Schedule of Revenue by Major Customers by Reporting Segments

The table below shows the amount 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

		2021				2020				2021				2020
		Three months ended October 31,								Six months ended October 31,
		2021				2020				2021				2020
		(in thousands)								(in thousands)
Eni S.p.A.		$	14			$	72			$	14			$	99
Department of Energy			81				—				81				—
EGP			14				42				163				157
Clark Hill			30				—				37				—
Matthews			30				—				30				—
Valaris			47				—				135				—
Other (no customer over 10%)			31				4				59				31
Revenues			247				118				519				287

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs

		2021				2020				2021				2020
		Three months ended October 31,								Six months ended October 31,
		2021				2020				2021				2020
		(in thousands)
Engineering and product development		$	125			$	22			$	342			$	59
Selling, general and administrative			32				85				205				164
Total share-based compensation expense		$	157			$	107			$	547			$	223

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