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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | Apr. 30, 2019 | Apr. 30, 2018
--- | --- | ---
Tax Credit Carryforward [Line Items] |  |
Valuation allowance | $ 3,630 | $ 2,467
State [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Gross amount of state tax credit carryforwards | 4,600 | 5,200
Net deferred tax assets related to tax credit carryforwards | 800 | 1,500
State [Member] | Other Liabilities [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Net deferred tax assets related to tax credit carryforwards | 1,000 | $ 1,300
Foreign Tax Authority [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Valuation allowance | 700 |
Gross amount of state tax credit carryforwards | 700 |
Investment Tax Credit Carryforward [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Valuation allowance | $ 500 |

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- Definition Deferred Tax Assets, Tax Credit Carryforwards, Net + References No definition available. + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
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