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Summary of Significant Accounting Policies (Tables) | 6 Months Ended
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Oct. 31, 2020
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.
|  | October 31, 2020 |  |  | April 30, 2020 |
|  | (in thousands) |
Checking and savings accounts |  | $ | 2,369 |  |  | $ | 1,551 |
Money market account |  |  | 12,875 |  |  |  | 8,451 |
|  | $ | 15,244 |  |  | $ | 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.
|  | October 31, 2020 |  |  | April 30, 2020 |
|  | (in thousands) |
Cash and cash equivalents |  | $ | 15,244 |  |  | $ | 10,002 |
Restricted cash- short term |  |  | 384 |  |  |  | 707 |
Restricted cash- long term |  |  | 222 |  |  |  | 221 |
|  | $ | 15,850 |  |  | $ | 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 October 31, |  |  | Six months ended October 31, |
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Eni S.p.A. |  |  | 61 | % |  |  | 23 | % |  |  | 34 | % |  |  | 19 | %
Premier Oil UK Limited |  |  | 0 | % |  |  | 13 | % |  |  | 9 | % |  |  | 30 | %
EGP |  |  | 36 | % |  |  | 47 | % |  |  | 55 | % |  |  | 24 | %
U.S. Navy |  |  | 0 | % |  |  | 10 | % |  |  | 0 | % |  |  | 17 | %
Other |  |  | 3 | % |  |  | 7 | % |  |  | 2 | % |  |  | 10 | %
|  |  | 100 | % |  |  | 100 | % |  |  | 100 | % |  |  | 100 | %
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 six months ended October 31, 2020 and 2019:
|  | Three months ended October 31, |  |  | Six months ended October 31, |
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
|  | (in thousands) |
Engineering and product development |  | $ | 22 |  |  | $ | 20 |  |  | $ | 59 |  |  | $ | 40 |
Selling, general and administrative |  |  | 85 |  |  |  | 56 |  |  |  | 164 |  |  |  | 128 |
Total share-based compensation expense |  | $ | 107 |  |  | $ | 76 |  |  | $ | 223 |  |  | $ | 168 |
Santander Bank [Member] |
Schedule of Cash and Cash Equivalents and Restricted Cash | Restricted cash includes the following:
|  | October 31, 2020 |  |  | April 30, 2020 |
|  | (in thousands) |
Santander Bank |  |  | 606 |  |  |  | 928 |
|  | $ | 606 |  |  | $ | 928 |

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 + Details
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- Definition 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. + References No definition available. + Details
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