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Note 5 - Stockholders' Equity and Dilutive Equity Instruments (Details Textual) - $ / shares | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020
Out-of-the-money Warrants [Member] |  |
Class of Warrant or Right, Outstanding (in shares) | 5,923,399 | 5,923,399
Series A Warrants [Member] |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 57.06 | $ 57.06
Series B Warrants [Member] |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | 62.28 | 62.28
GLF Equity Warrants [Member] |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 100.00 | $ 100.00
In-the-money Warrants and Restricted Stock Units [Member] |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | 2,932,590 | 2,402,241

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21475-112644 + Details
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