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Note 12 - Accounting for the Costs of Computer Software Developed for Internal Use (Details Textual) - USD ($) | 12 Months Ended
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Apr. 30, 2017 | Apr. 30, 2016 | Apr. 30, 2015
Capitalized Computer Software, Additions | $ 407,000 | $ 1,681,000 |
Internal Costs to Develop Software | 215,000 | 1,250,000 |
Third Party Programmers Costs | 192,000 | 431,000 |
Capitalized Computer Software, Amortization | 4,397,000 | $ 3,520,000 | $ 2,421,000
Capitalized Computer Software, Increase in Amortization | $ 877,000 |  |
Minimum [Member] |  |  |
Finite-Lived Intangible Asset, Useful Life | 3 years |  |
Maximum [Member] |  |  |
Finite-Lived Intangible Asset, Useful Life | 5 years |  |

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- Definition Additions made to capitalized computer software costs during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Amount of expense for amortization of capitalized computer software costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128487-111756 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount of increase in amortization expense for capitalized computer software as compared to the corresponding period in preceding fiscal year + References No definition available. + Details
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- Definition Represents the internal costs to develop software. + References No definition available. + Details
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- Definition Represents the third party programmer costs. + References No definition available. + Details
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