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Note 15 - Equity Transaction - Shares Reserved for Future Issuance (Details) - shares | Mar. 31, 2020 | Dec. 31, 2019
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Common Stock, Capital Shares Reserved for Future Issuance (in shares) | 5,909,400 |
Convertible Preferred Stock [Member] |  |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) | 5,296,800 |
Warrant [Member] |  |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) | 612,600 |
Equity Option [Member] |  |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) |  |

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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Details
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