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Income Taxes (Details) - Schedule of Deferred Tax Assets and Liabilities - USD ($) $ in Thousands | Apr. 30, 2020 | Apr. 30, 2019
--- | --- | ---
Deferred tax assets: |  |
Employee benefits | $ 4,794 | $ 5,092
Inventory | 1,904 | 1,649
Accounts receivable | 207 | 204
Tax credits | 1,610 | 1,300
Other assets | 1,073 | 148
Lease Liability | 2,807 | 0
Capital Loss carry-forward | 2,515 | 2,455
Net operating loss carryforwards | 6,185 | 5,556
Total deferred tax asset | 21,095 | 16,404
Deferred tax liabilities: |  |
Property, plant and equipment | (1,518) | (1,344)
Right of use asset | (2,696) |
Other liabilities | (193) | (343)
Deferred state income tax | (842) | (767)
Net deferred tax asset | 15,846 | 13,950
Valuation allowance | (15,854) | (13,950)
Net deferred tax (liability) asset | $ (8) | $ 0

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