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Note 7 - Federal, State and Local Income Taxes (Details Textual) - USD ($) | 12 Months Ended
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Apr. 30, 2016 | Apr. 30, 2015 | Apr. 30, 2014
Deferred Tax Liabilities, Deferred Gain on Deconsolidation of Subsidiary Noncurrent | $ 50,510,000 |  |
Deferred Tax Assets, Deferred Non Cash Postemployment Compensation, Noncurrent | $ 1,770,000 |  |
Effective Income Tax Rate Reconciliation, Percent | 27.15% | 30.52% | 33.50%

X
- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319 + Details
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Balance Type: | na
Period Type: | duration

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- Definition Amount of deferred tax asset attributable to deductible temporary differences from deferred non-cash postemployment compensation, expected to be realized or consumed after one year (or the normal operating cycle, if longer). + References No definition available. + Details
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Balance Type: | credit
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- Definition Amount of deferred tax liability attributable to taxable temporary differences from deferred gain on deconsolidation of subsidiary, expected to be realized or consumed after one year (or the normal operating cycle, if longer). + References No definition available. + Details
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Namespace Prefix: | valu_
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Balance Type: | credit
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