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Share-Based Compensation (Details Narrative) - USD ($) | 3 Months Ended | 6 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 31, 2023 | Oct. 31, 2022 | Oct. 31, 2023 | Oct. 31, 2022 | Apr. 30, 2023 | Jan. 31, 2023 | Feb. 09, 2022 | Feb. 08, 2022 | Jan. 18, 2018 | Dec. 31, 2015
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Unrecognized compensation cost related to non-vested stock | $ 400,000 |  | $ 400,000 |  |  |  |  |  |  |
Share-based compensation of weighted-average period |  |  | 1 year 9 months 18 days |  |  |  |  |  |  |
Shares outstanding | 1,183,491 |  | 1,183,491 |  | 1,529,185 |  |  |  |  |
Share-Based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Options unvested | 766,000 |  | 766,000 |  |  |  |  |  |  |
Weighted average remaining contractual term |  |  | 8 years 9 months 18 days |  |  |  |  |  |  |
Share-based payment arrangement, expense | $ 20,000 | $ 72,000 | $ 98,000 | $ 168,000 |  |  |  |  |  |
Performance Shares [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based payment arrangement, expense | 0 | 48,000 | 43,000 | 101,000 |  |  |  |  |  |
Shares outstanding |  |  |  |  | 66,667 |  |  |  |  |
Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based payment arrangement, expense | 252,000 | $ 180,000 | $ 532,000 | $ 364,000 |  |  |  |  |  |
Share-based compensation of weighted-average period |  |  | 1 year 2 months 12 days |  |  |  |  |  |  |
Number of restricted shares, granted |  |  | 58,000 | 52,500 |  |  |  |  |  |
Unrecognized compensation cost | $ 554,000 |  | $ 554,000 |  |  |  |  |  |  |
2015 Omnibus Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based compensation arrangement shares authorized |  |  |  |  |  | 4,382,036 |  |  |  | 1,332,036
Share-based compensation arrangement shares aggregate increase |  |  |  |  |  | $ 3,050,000 |  |  |  |
Capital shares reserved for future issuance | 684,000 |  | 684,000 |  |  |  |  |  |  |
2018 Inducement Plan [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based compensation arrangement shares authorized |  |  |  |  |  |  | 275,000 | 250,000 |  |
Capital shares reserved for future issuance |  |  |  |  |  |  |  |  | 25,000 |
Available for grant | 111,000 |  | 111,000 |  |  |  |  |  |  |

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