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Summary of Accounting Policies (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Apr. 30, 2020 | Apr. 30, 2019 | May 01, 2020
Summary of Accounting Policies (Details) [Line Items] |  |  |
Retained Earnings (Accumulated Deficit) | $ (12,137) | $ (2,111) |
Revenues | 41,507 | 49,509 |
Operating Lease, Right-of-Use Asset | 10,864 | 0 | $ 12,100
POC Revenue [Member] |  |  |
Summary of Accounting Policies (Details) [Line Items] |  |  |
Revenues | $ 38,000 | $ 45,300 |
Building [Member] |  |  |
Summary of Accounting Policies (Details) [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 40 years |  |
Other Depreciable Assets [Member] | Minimum [Member] |  |  |
Summary of Accounting Policies (Details) [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 3 years |  |
Other Depreciable Assets [Member] | Maximum [Member] |  |  |
Summary of Accounting Policies (Details) [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 10 years |  |

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