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Note 15 - Stock Based Compensation - Stock Option Activity (Details)
 12 Months Ended
Dec. 31, 2022
$ / shares
shares
Options outstanding, beginning of period (in shares) | shares 20,631
Options outstanding, beginning of period, weighted average exercise price (in dollars per share) $ 25.30
Options outstanding at January 1, 2022 (in dollars per share) $ 3.46
Options granted (in shares) | shares 0
Options granted, weighted average exercise price (in dollars per share) $ 0
Options exercised (in shares) | shares 0
Options exercised weighted average exercise price (in dollars per share) $ 0
Options exercised (in dollars per share) $ 0
Options forfeited or expired (in shares) | shares 0
Options forfeited or expired weighted average exercise price (in dollars per share) $ 0
Options forfeited or expired (in dollars per share) $ 0
Options outstanding, end of period (in shares) | shares 20,631
Options outstanding, end of period, weighted average exercise price (in dollars per share) $ 25.30
Options outstanding, end of year (in dollars per share) $ 3.46
Options exercisable (in shares) | shares 20,631
Options exercisable, weighted average exercise price (in dollars per share) $ 25.30
Options exercisable at December 31, 2022 (in dollars per share) $ 3.46