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Note 2 - Basis of Presentation (Details Textual) | Sep. 25, 2020 | Jan. 21, 2020 | Apr. 30, 2019
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Reverse Stock Split [Member] |  |  |
Stockholders' Equity Note, Stock Split, Conversion Ratio | 20 | 2,000 | 500

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- Definition Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB TOPIC 4.C) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187143-122770 + Details
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