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Summary of Significant Accounting Policies (Tables)

9 Months Ended

Jan. 31, 2021

Schedule of Cash and Cash Equivalents

The Company considers all highly liquid investments with a maturity of three months or less when purchased to be cash equivalents. The Company invests excess cash in a money market account.

		January 31, 2021				April 30, 2020
		(in thousands)
Checking and savings accounts		$	2,597			$	1,551
Money market account			77,204				8,451
		$	79,801			$	10,002

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 Statement of Financial Position that sum to the total of the same such amounts shown in the Statement of Cash Flows.

		January 31, 2021				April 30, 2020
		(in thousands)
Cash and cash equivalents		$	79,801			$	10,002
Restricted cash- short term			384				707
Restricted cash- long term			222				221
		$	80,407			$	10,930

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:

		Three months ended January 31,								Nine months ended January 31,
		2021				2020				2021				2020
		(in thousands)
Eni S.p.A.		$	34			$	42			$	135			$	118
Premier Oil UK Limited			-				5				27				126
EGP			223				678				379				774
ACET			33				-				37				-
Other			27				-				26				113
		$	317			$	725			$	604			$	1,131

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

The following table summarizes share-based compensation related to the Company’s share-based plans by expense category for the three and nine months ended January 31, 2021 and 2020:

		Three months ended January 31,								Nine months ended January 31,
		2021				2020				2021				2020
		(in thousands)
Engineering and product development		$	32			$	12			$	91			$	52
Selling, general and administrative			83				44				247				173
Total share-based compensation expense		$	115			$	56			$	338			$	225

Santander Bank, N.A. [Member]

Schedule of Cash and Cash Equivalents and Restricted Cash

Restricted cash includes the following:

		January 31, 2021				April 30, 2020
		(in thousands)
Santander Bank			606				928
		$	606			$	928

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