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Share-Based Compensation (Details Narrative) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 31, 2021 | Jan. 31, 2020 | Dec. 31, 2019 | Jan. 31, 2021 | Jan. 31, 2020 | Jan. 31, 2021 | Jan. 31, 2020 | Jan. 18, 2018 | Dec. 31, 2015
Restricted stock options, granted during period |  |  |  | 10,000 | 10,000 | 13,513 | 13,513 |  |
Employee Stock Option [Member] |  |  |  |  |  |  |  |  |
Number of shares granted during the period |  |  |  | 248,876 | 248,876 | 411,666 | 411,666 |  |
Share-based compensation intrinsic value of outstanding | $ 900,000 |  |  | $ 900,000 |  | $ 900,000 |  |  |
Share-based compensation options, exercisable intrinsic value | $ 600,000 |  |  | $ 600,000 |  | $ 600,000 |  |  |
Share-based compensation unvested shares of stock options | 269,208 |  |  | 269,208 |  | 269,208 |  |  |
Share-based compensation weighted average remaining contractual term |  |  |  |  |  | 9 years 10 months 25 days |  |  |
Share-based compensation expense |  |  |  | $ 82,000 | $ 44,000 | $ 300,000 | $ 200,000 |  |
Employee Stock Option [Member] | Performance-based Stock Options [Member] | Two Executives [Member] |  |  |  |  |  |  |  |  |
Number of shares granted during the period | 344,723 | 81,334 |  |  |  |  |  |  |
Stock options vesting period, description | The awards vest over 2 years provided there is positive total shareholder return (e.g. share price increase) as measured to the closing share price on Jannuary 14, 2022 and January 14, 2023. | The awards can vest over 2 years if there is positive total shareholder return (e.g. share price increase) as measured to the 5-day (January 11-15, 2021) and (January 10-14, 2022) share price Volume Weighted Average Price ("VWAP"). |  |  |  |  |  |  |
Employee Stock Option [Member] | Subject to Service- Based Vesting Requirements [Member] | Employee [Member] |  |  |  |  |  |  |  |  |
Unrecognized compensation cost related to non-vested stock options | $ 0 |  |  | 0 |  | 0 |  |  |
Restricted stock options, granted during period |  |  | 51,547 |  |  |  |  |  |
Employee Stock Option One [Member] |  |  |  |  |  |  |  |  |
Share-based compensation intrinsic value of outstanding | 300,000 |  |  | 300,000 |  | 300,000 |  |  |
Non-vested Stock [Member] |  |  |  |  |  |  |  |  |
Unrecognized compensation cost related to non-vested stock options | 700,000 |  |  | 700,000 |  | $ 700,000 |  |  |
Share-based compensation cost expected to recognize weighted-average term |  |  |  |  |  | 1 year 10 months 25 days |  |  |
Performance Stock Options [Member] |  |  |  |  |  |  |  |  |
Share-based compensation intrinsic value of outstanding | 600,000 |  |  | 600,000 |  | $ 600,000 |  |  |
Share-based compensation options, exercisable intrinsic value | $ 0 |  |  | $ 0 |  | $ 0 |  |  |
Share-based compensation unvested shares of stock options | 385,389 |  |  | 385,389 |  | 385,389 |  |  |
Share-based compensation unvested shares of stock options intrinsic value | $ 500,000 |  |  | $ 500,000 |  | $ 500,000 |  |  |
Share-based compensation weighted average remaining contractual term |  |  |  |  |  | 9 years 9 months 18 days |  |  |
Share-based compensation expense |  |  |  | 26,000 | 1,600 | $ 43,000 | 1,600 |  |
Unrecognized compensation cost related to non-vested stock options | 700,000 |  |  | 700,000 |  | $ 700,000 |  |  |
Share-based compensation cost expected to recognize weighted-average term |  |  |  |  |  | 1 year 9 months 18 days |  |  |
Restricted Stock [Member] |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  | 2,000 | 5,000 | $ 12,000 | 10,000 |  |
Share-based compensation cost expected to recognize weighted-average term |  |  |  |  |  | 1 year |  |  |
Unrecognized compensation cost remaining related to unvested restricted stock | $ 28,000 |  |  | 28,000 |  | $ 28,000 |  |  |
Stock Option [Member] | Subject to Service- Based Vesting Requirements [Member] | Employee [Member] |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  | $ 5,000 | $ 7,000 | $ 30,000 | $ 8,000 |  |
2015 Omnibus Incentive Plan [Member] |  |  |  |  |  |  |  |  |
Share-based compensation arrangement by share-based payment award, number of shares authorized |  |  |  |  |  |  |  |  | 1,332,036
Stock based compensation shares, available for grant | 193,928 |  |  | 193,928 |  | 193,928 |  |  |
2018 Inducement Plan [Member] |  |  |  |  |  |  |  |  |
Stock based compensation shares, available for grant | 11,487 |  |  | 11,487 |  | 11,487 |  | 25,000 |

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