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Summary of Significant Accounting Policies (Tables) | 9 Months Ended
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Jan. 31, 2022
Accounting Policies [Abstract] |
Schedule of Cash and Cash Equivalents | Schedule of Cash and Cash Equivalents
|  | January 31, 2022 |  |  | April 30, 2021 |
|  | (in thousands) |
Checking and savings accounts |  | $ | 1,519 |  |  | $ | 1,850 |
Money market account |  |  | 61,935 |  |  |  | 81,178 |
|  | $ | 63,454 |  |  | $ | 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
|  | January 31, 2022 |  |  | April 30, 2021 |
|  | (in thousands) |
Cash and cash equivalents |  | $ | 63,454 |  |  | $ | 83,028 |
Restricted cash- short term |  |  | 384 |  |  |  | 384 |
Restricted cash- long term |  |  | 222 |  |  |  | 222 |
Cash, cash equivalents and restricted cash |  | $ | 64,060 |  |  | $ | 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
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
|  | Three months ended January 31, |  |  | Nine months ended January 31, |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
|  | (in thousands) |  |  | (in thousands) |
Eni S.p.A. |  | $ | — |  |  | $ | 34 |  |  | $ | 14 |  |  | $ | 135 |
Department of Energy |  |  | 102 |  |  |  | — |  |  |  | 182 |  |  |  | — |
EGP |  |  | — |  |  |  | 223 |  |  |  | 163 |  |  |  | 379 |
ACET |  |  | — |  |  |  | 33 |  |  |  | — |  |  |  | 37 |
Valaris (1) |  |  | 7 |  |  |  | — |  |  |  | 142 |  |  |  | — |
Brigham Young University (2) |  |  | 66 |  |  |  | — |  |  |  | 66 |  |  |  | — |
Nippon Kaiyo (2) |  |  | 78 |  |  |  | — |  |  |  | 78 |  |  |  | — |
Naval Surface Warfare Center (2) |  |  | 98 |  |  |  | — |  |  |  | 98 |  |  |  | — |
Other (no customer over 10%) |  |  | 133 |  |  |  | 27 |  |  |  | 260 |  |  |  | 53 |
Revenues |  | $ | 484 |  |  | $ | 317 |  |  | $ | 1,003 |  |  | $ | 604 |
(1) | 3Dent related consulting
(2) | MAR related sales
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs | Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
|  | Three months ended January 31, |  |  | Nine months ended January 31, |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
|  | (in thousands) |  |  | (in thousands) |
Engineering and product development |  | $ | 209 |  |  | $ | 32 |  |  | $ | 551 |  |  | $ | 91 |
Selling, general and administrative |  |  | 108 |  |  |  | 83 |  |  |  | 313 |  |  |  | 247 |
Total share-based compensation expense |  | $ | 317 |  |  | $ | 115 |  |  | $ | 864 |  |  | $ | 338 |

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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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