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Note 10 - Accounting for the Costs of Computer Software Developed for Internal Use (Details Textual) - USD ($)	3 Months Ended
	Jul. 31, 2019	Jul. 31, 2018
Capitalized Computer Software, Amortization	$ 19,000	$ 44,000
Internal Costs to Develop Software	$ 0	$ 0
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life	5 years

X

- 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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X

- 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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Namespace Prefix:	us-gaap_
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X

- Definition

Represents the internal costs to develop software.

+ References

No definition available.

+ Details

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