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Summary of Significant Accounting Policies (Tables)

3 Months Ended

Jul. 31, 2021

Accounting Policies [Abstract]

Schedule of Cash and Cash Equivalents

 Schedule of Cash and Cash Equivalents

		July 31, 2021				April 30, 2021
		(in thousands)
Checking and savings accounts		$	1,022			$	1,850
Money market account			76,698				81,178
		$	77,720			$	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

		July 31, 2021				April 30, 2021
			(in thousands)
Cash and cash equivalents		$	77,720			$	83,028
Restricted cash- short term			384				384
Restricted cash- long term			222				222
		$	78,326			$	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

		Three months ended July 31,
		2021				2020
		(in thousands)
Eni S.p.A.		$	-			$	28
Harbour (p/k/a Premier Oil)			-				27
EGP			149				114
Valaris			89				-
Other (no customer over 10%)			34				-
		$	272			$	169

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

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

		Three months ended July 31,
		2021				2020
		(in thousands)
Engineering and product development		$	217			$	37
Selling, general and administrative			173				79
Total share-based compensation expense		$	390			$	116

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Tabular disclosure of the extent of the entity's reliance on its major customers, if revenues from transactions with a single external customer amount to 10 percent or more of entity revenues, including the disclosure of that fact, the total amount of revenues from each such customer, and the identity of the reportable segment or segments reporting the revenues. The entity need not disclose the identity of a major customer or the amount of revenues that each segment reports from that customer. For these purposes, a group of companies known to the entity to be under common control is considered a single customer, and the federal government, a state government, a local government such as a county or municipality, or a foreign government is each considered a single customer.

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