Note 12 - Accounting for the Costs of Computer Software Developed for Internal Use (Details Textual) - USD ($)	12 Months Ended
Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2016
Capitalized Computer Software, Additions	$ 0	$ 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	$ 848,000	$ 4,397,000	$ 3,520,000
Minimum [Member]
Finite-Lived Intangible Asset, Useful Life	3 years
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life	5 years

Additions made to capitalized computer software costs during the period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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

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- Definition

Amount of expense for amortization of capitalized computer software costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-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

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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.

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- Definition

Represents the internal costs to develop software.

+ References

No definition available.

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- Definition

Represents the third party programmer costs.

+ References

No definition available.

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