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Stock-Based Compensation (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Oct. 31, 2021 | Oct. 31, 2020 | Oct. 31, 2021 | Oct. 31, 2020 | Apr. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation expense | $ 1,216 | $ 1,266 | $ 2,393 | $ 2,227 |
Liability for payment of the RSTUs | 44,738 |  | $ 44,738 |  | $ 58,577
Employee Service-Based RSUs [Member] | 2016 employee stock incentive plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Awarded in period (shares) |  |  | 30,984 |  |
Employee Performance-Based RSUs [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Common stock issuable per RSU granted (shares) |  |  | 1 |  |
Employee Performance-Based RSUs [Member] | 2016 employee stock incentive plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Awarded in period (shares) |  |  | 57,476 |  |
Employee Performance-Based RSTUs [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Restricted stock units non vested grants (shares) |  |  | 5,794 |  |
Employee Service-Based RSTUs [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Restricted stock units non vested grants (shares) |  |  | 3,096 |  |
RSTUs [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation expense | 100 | $ 200 | $ (0) | $ 400 |
Liability for payment of the RSTUs | $ 700 |  | $ 700 |  | $ 1,000
Non-Employee Service-Based Restricted Stock Units | 2015 non-employee directors equity ownership plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Awarded in period (shares) | 10,320 |  |  |  |
Cliff Vest [Member] | RSUs [Member] | 2016 employee stock incentive plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period, years |  |  | 3 years |  |
Cliff Vest [Member] | RSTUs [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period, years |  |  | 3 years |  |
Daily Vest | RSUs [Member] | 2015 non-employee directors equity ownership plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period, years |  |  | 2 years |  |

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