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Note 14 - Stockholders' Equity - Outstanding Warrants (Details) - $ / shares
shares in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Outstanding warrants (in shares) 202 201
Outstanding warrants, weighted-average exercise price (in dollars per share) $ 57.13 $ 57.13
Warrants granted (in shares) 2,431 1
Warrants granted, weighted average exercise price (in dollars per share) $ 8.18 $ 23.51
Warrants expired (in shares) (0) 0
Warrants expired, weighted average exercise price (in dollars per share) $ 0 $ 0
Warrants exercised (in shares) (327)  
Warrants exercised, weighted-average exercise price (in dollars per share) $ 6.30  
Warrants expired (in shares) 0 0
Outstanding warrants (in shares) 2,306 202
Outstanding warrants, weighted-average exercise price (in dollars per share) $ 7.70 $ 57.13