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Note 15 - Equity-based Compensation - Stock Options Outstanding (Details) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Outstanding awards (in shares) 4,449,000    
Outstanding, weighted-average exercise price (in dollars per share) $ 1.39    
Outstanding, weighted-average remaining contractual life (Year) 7 years 4 months 24 days   7 years 7 months 6 days
Outstanding, aggregate intrinsic value $ 308   $ 460
Options granted (in shares) 336,000 92,000  
Options granted, weighted-average exercise price (in dollars per share) $ 0.30    
Restricted stock units granted (in shares) 180,000 900,000  
Options forfeited/cancelled (in shares) (37,000)    
Options forfeited/cancelled, weighted-average exercise price (in dollars per share) $ 8.05    
Outstanding awards (in shares) 4,778,000   4,449,000
Outstanding, weighted-average exercise price (in dollars per share) $ 1.25   $ 1.39
Outstanding, aggregate intrinsic value $ 308   $ 460
Vested and expected to vest (in shares) 4,446,000    
Vested and expected to vest, weighted-average exercise price (in dollars per share) $ 1.31    
Vested and expected to vest, weighted-average remaining contractual life (Year) 7 years 3 months 18 days    
Vested and expected to vest, aggregate intrinsic value $ 272    
Vested (in shares) 2,280,000    
Vested, weighted-average exercise price (in dollars per share) $ 2.24    
Vested, weighted-average remaining contractual life (Year) 5 years 7 months 6 days    
Exercisable (in shares) 2,280,000    
Exercisable, weighted-average exercise price (in dollars per share) $ 2.24    
Exercisable, weighted-average remaining contractual life (Year) 5 years 7 months 6 days    
Restricted Stock Units (RSUs) [Member]      
Restricted stock units granted (in shares) 180,000    
Restricted stock units vested (in shares) (120,000)    
Restricted stock units cancelled (in shares) (30,000)