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Significant Accounting Policies - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 31, 2021 | Oct. 31, 2020 | Jul. 31, 2020 | Jan. 31, 2020 | Oct. 31, 2019 | Jul. 31, 2019 | Jan. 31, 2021 | Jan. 31, 2020 | Apr. 30, 2020 | May 01, 2019
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |  |
Cash equivalents | $ 0 |  |  |  |  |  | $ 0 |  | $ 0 |
Net income | 740,000 | $ 1,000 | $ 75,000 | $ 407,000 | $ 307,000 | $ (641,000) | 816,000 | $ 72,000 |  |
Net cash provided by (used in) operating activities |  |  |  |  |  |  | 299,000 | 360,000 |  |
Accumulated deficit | 71,857,000 |  |  |  |  |  | 71,857,000 |  | 72,673,000 |
Working capital deficit | 2,600,000 |  |  |  |  |  | 2,600,000 |  |  |
Cash and cash equivalents | 7,429,000 |  |  |  |  |  | 7,429,000 |  | 8,342,000 |
Unrecognized tax benefits | 181,000 |  |  |  |  |  | 181,000 |  | 178,000 |
Income tax penalties and interest expense |  |  |  |  |  |  | 3,000 |  |  |
Unrecognized Tax Benefits Income Tax Penalties Anticipate Additional Unrecognized |  |  |  |  |  |  | 4,500 |  |  |
Provision for income taxes | 15,000 |  |  | $ 12,000 |  |  | 43,000 | $ 38,000 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Operating lease right-of-use assets, net | $ 5,380,000 |  |  |  |  |  | $ 5,380,000 |  | $ 2,798,000 |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Operating lease right-of-use assets, net |  |  |  |  |  |  |  |  |  | $ 3,200,000
Deferred rent |  |  |  |  |  |  |  |  |  | 900,000
Operating lease liability |  |  |  |  |  |  |  |  |  | $ 4,100,000

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