Note 13 - Stock Warrants (Details Textual) |
Mar. 31, 2019
$ / shares
shares
|
|---|---|
| Class of Warrant or Right, Outstanding | shares | 818,000 |
| MT [Member] | |
| Class of Warrant or Right, Outstanding | shares | 300 |
| Class of Warrant or Right, Exercise Price of Warrants or Rights | $ 2,000 |
| Minimum [Member] | |
| Class of Warrant or Right, Exercise Price of Warrants or Rights | $ 0.20 |
| Warrants and Rights Outstanding, Term | 150 days |
| Maximum [Member] | |
| Class of Warrant or Right, Exercise Price of Warrants or Rights | $ 50 |
| Warrants and Rights Outstanding, Term | 16 years 182 days |
| Weighted Average [Member] | |
| Class of Warrant or Right, Exercise Price of Warrants or Rights | $ 22.98 |
| X | ||||||||||
- Definition Exercise price per share or per unit of warrants or rights outstanding. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Number of warrants or rights outstanding. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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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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