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Note 12 - Equity-based Compensation - Stock Appreciation Rights (Details) - Stock Appreciation Rights (SARs) [Member] - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Outstanding, stock appreciation rights (in shares) 58,365  
Outstanding, weighted average exercise price (in dollars per share) $ 866.54  
Outstanding, beginning balance, weighted average fair value (in dollars per share) $ 204.29  
Outstanding, aggregate intrinsic value $ 37,042 $ 79,446
Weighted average remaining contractual term, outstanding (Year) 7 years 2 months 12 days 7 years 3 months 18 days
Granted, stock appreciation rights (in shares) 3,500  
Granted, weighted average exercise price (in dollars per share) $ 2,041.73  
Granted, weighted average fair value (in dollars per share) $ 548.01  
Weighted average remaining contractual term, granted (Year) 9 years 6 months  
Exercised, stock appreciation rights (in shares) (13,779)  
Exercised, weighted average exercise price (in dollars per share) $ 597.19  
Exercised, weighted average fair value (in dollars per share) $ 133.96  
Exercised, aggregate intrinsic value $ 18,948  
Forfeited, stock appreciation rights (in shares) (1,601)  
Forfeited, weighted average exercise price (in dollars per share) $ 834.92  
Forfeited, weighted average fair value (in dollars per share) $ 201.50  
Outstanding, stock appreciation rights (in shares) 46,485 58,365
Outstanding, weighted average exercise price (in dollars per share) $ 1,035.95 $ 866.54
Outstanding, beginning balance, weighted average fair value (in dollars per share) $ 251.11 $ 204.29
Weighted average remaining contractual term, outstanding (Year) 7 years 2 months 12 days 7 years 3 months 18 days
Vested and exercisable, stock appreciation rights (in shares) 20,673  
Vested and exercisable, weighted average exercise price (in dollars per share) $ 748.02  
Vested and exercisable, weighted average fair value (in dollars per share) $ 174.45  
Vested and exercisable, aggregate intrinsic value $ 22,019  
Weighted average remaining contractual term, vested and exercisable (Year) 6 years 3 months 18 days