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Note 12 - Stockholders' Equity - Warrants (Details) - shares
12 Months Ended
Aug. 17, 2021
Dec. 31, 2021
Balance, Warrants (in shares)   515,000
Common stock exchanged to prefunded warrant (in shares) 500,000 500,000
Exercises and conversions (in shares)   0
Balance, Warrants (in shares)   1,015,000