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Note 14 - Stockholders' Equity - Outstanding Warrants (Details)
shares in Thousands
 12 Months Ended
Dec. 31, 2021
$ / shares
shares
Outstanding warrants (in shares) | shares 7,067
Outstanding warrants, weighted-average exercise price (in dollars per share) | $ / shares $ 1.63
Warrants granted (in shares) | shares 15
Warrants granted, weighted average exercise price (in dollars per share) | $ / shares $ 0.67
Warrants expired (in shares) | shares 0
Warrants expired, weighted average exercise price (in dollars per share) | $ / shares $ 0
Outstanding warrants (in shares) | shares 7,082
Outstanding warrants, weighted-average exercise price (in dollars per share) | $ / shares $ 1.63