Note 12 - Stock Warrants (Details Textual) - $ / shares |
1 Months Ended | 6 Months Ended | |
|---|---|---|---|
May 31, 2020 |
Jun. 30, 2020 |
Jun. 30, 2019 |
|
| Class of Warrant or Right, Outstanding (in shares) | 991,874 | ||
| Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 18.37 | ||
| Minimum [Member] | |||
| Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 0.20 | ||
| Warrants and Rights Outstanding, Term (Year) | 1 year | ||
| Maximum [Member] | |||
| Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 49.80 | ||
| Warrants and Rights Outstanding, Term (Year) | 15 years 36 days | ||
| Series OO Warrants [Member] | |||
| Class of Warrant or Right, Exercised During Period (in shares) | 411,000 | 411,000 | |
| Issued Stock Upon Exercise of Warrants, Shares (in shares) | 300,595 | 300,595 | |
| X | ||||||||||
- Definition The number of warrants or rights exercised during period. No definition available.
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| X | ||||||||||
- Definition The amount of stock issued upon the exercise of warrants. No definition available.
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| X | ||||||||||
- Definition Exercise price per share or per unit of warrants or rights outstanding. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Number of warrants or rights outstanding. No definition available.
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| X | ||||||||||
- Definition Period between issuance and expiration of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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- Details
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