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Note 8 - Federal, State and Local Income Taxes - Schedule of Components of Deferred Tax Asset and Deferred Tax Liability (Details) - USD ($) $ in Thousands | Jul. 31, 2017 | Apr. 30, 2017
--- | --- | ---
Total federal tax liability | $ 18,583 | $ 18,377
Deferred tax liability, long term | 18,583 | 18,377
Domestic Tax Authority [Member] |  |
Deferred non-cash post-employment compensation | (619) | (619)
Depreciation and amortization | 391 | 454
Other | (114) | (366)
Other | (114) | (366)
Total federal tax liability | 17,405 | 17,211
Deferred gain on deconsolidation of EAM | 17,747 | 17,742
Deferred tax liability, long term | 17,405 | 17,211
State and Local Jurisdiction [Member] |  |
Deferred non-cash post-employment compensation | (39) | (42)
Depreciation and amortization | 25 | 31
Other | 78 | (29)
Other | 78 | (29)
Total federal tax liability | 1,178 | 1,166
Deferred gain on deconsolidation of EAM | 1,114 | 1,206
Deferred tax liability, long term | $ 1,178 | $ 1,166

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- Definition Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences, with jurisdictional netting and classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e31931-109318 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e31958-109318 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e31917-109318 + Details
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- Definition Amount of deferred tax liability attributable to taxable temporary differences classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=96869850&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 + Details
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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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- Definition Amount of deferred tax (asset) liability attributable to deductible temporary differences from depreciation and amortization, 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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- 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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