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Note 10 - Stock-based Compensation - Phantom Stock Units (Details) - Phantom Share Units (PSUs) [Member]
12 Months Ended
Dec. 31, 2021
$ / shares
shares
Outstanding, shares (in shares) | shares 634,759
Outstanding, grant date fair value (in dollars per share) | $ / shares $ 3.86
Granted, shares (in shares) | shares 1,887,486
Granted, grant date fair value (in dollars per share) | $ / shares $ 7.04
Vested, shares (in shares) | shares (173,961)
Vested, grant date fair value (in dollars per share) | $ / shares $ 3.86
Canceled or forfeited, shares (in shares) | shares (94,884)
Canceled or forfeited, grant date fair value (in dollars per share) | $ / shares $ 4.86
Outstanding, shares (in shares) | shares 2,253,400
Outstanding, grant date fair value (in dollars per share) | $ / shares $ 6.47