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Note 7 - Stockholders' Equity - Summary of Warrants (Details) | Dec. 31, 2019 $ / shares shares
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Series G Warrants [Member] |
Exercise price (in dollars per share) | $ / shares | $ 25,440
Number of warrants (in shares) | shares | 48
Series H Warrants [Member] |
Exercise price (in dollars per share) | $ / shares | $ 1.15
Number of warrants (in shares) | shares | 217,392
Series I Warrants [Member] |
Exercise price (in dollars per share) | $ / shares | $ 15,000
Number of warrants (in shares) | shares | 48

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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