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Note 12 - Warrants - Summary of Outstanding Warrants (Details) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Warrants Classified as Equity [Member] |  |  |
Balance, warrants (in shares) | 1,367,737 | 1,475,633 |
Balance, warrants, weighted average exercise price (in dollars per share) | $ 13.44 | $ 13.86 |
Balance, warrants, weighted average remaining contractual life (Year) | 3 years 10 months 28 days | 1 year 8 months 23 days | 2 years 9 months 29 days
Warrants issued, warrants (in shares) | 1,950,502 | 0 |
Warrants issued, warrants, weighted average exercise price (in dollars per share) | $ 4.60 | $ 0 |
Warrants exercised, warrants (in shares) | (1,950,502) |  |
Warrants exercised, warrants, weighted average exercise price (in dollars per share) | $ 4.60 |  |
Warrants exercised, warrants, weighted average remaining contractual life (Year) | 4 years 10 months 9 days |  |
Warrants expired, warrants (in shares) | (130,712) | (107,896) |
Warrants expired, warrants, weighted average exercise price (in dollars per share) | $ 10.44 | $ 14.07 |
Warrants reclassified, warrants (in shares) | 4,587,002 |  |
Warrants reclassified, warrants, weighted average exercise price (in dollars per share) | $ 4.90 |  |
Warrants reclassified, warrants, weighted average remaining contractual life (Year) | 4 years 8 months 23 days |  |
Balance, warrants (in shares) | 5,824,027 | 1,367,737 | 1,475,633
Balance, warrants, weighted average exercise price (in dollars per share) | $ 6.56 | $ 13.44 | $ 13.86
Warrants Classified as Liability [Member] |  |  |
Balance, warrants (in shares) | 0 |  |
Balance, warrants, weighted average exercise price (in dollars per share) | $ 0 |  |
Warrants issued, warrants (in shares) | 4,587,002 |  |
Warrants issued, warrants, weighted average exercise price (in dollars per share) | $ 4.90 |  |
Warrants reclassified, warrants (in shares) | (4,587,002) |  |
Warrants reclassified, warrants, weighted average exercise price (in dollars per share) | $ (4.90) |  |
Warrants reclassified, warrants, weighted average remaining contractual life (Year) | 5 years |  |
Balance, warrants (in shares) | 0 | 0 |
Balance, warrants, weighted average exercise price (in dollars per share) | $ 0 | $ 0 |

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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 https://asc.fasb.org/extlink&oid=126973232&loc=d3e21475-112644 + Details
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