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Note 8 - Equity-based Compensation - Summary of Stock Appreciation Rights (Details) - Stock Appreciation Rights (SARs) [Member] - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Outstanding, stock appreciation rights (in shares) 136,000  
Outstanding, weighted average exercise price (in dollars per share) $ 426.80  
Outstanding, Beginning Balance, weighted average fair value (in dollars per share) $ 88.07  
Outstanding, aggregate intrinsic value $ 24,790 $ 26,510
Weighted Average Remaining Contractual Term, Outstanding (Year) 8 years 219 days 8 years 255 days
Granted, stock appreciation rights (in shares) 20,000  
Granted, weighted average exercise price (in dollars per share) $ 619.66  
Granted, weighted average fair value (in dollars per share) $ 138.01  
Weighted Average Remaining Contractual Term, Granted (Year) 9 years 292 days  
Exercised, stock appreciation rights (in shares) (5,625)  
Exercised, weighted average exercise price (in dollars per share) $ 422.31  
Exercised, weighted average fair value (in dollars per share) $ 87.22  
Forfeited, stock appreciation rights (in shares) (5,200)  
Forfeited, weighted average exercise price (in dollars per share) $ 422.31  
Forfeited, weighted average fair value (in dollars per share) $ 87.22  
Outstanding, stock appreciation rights (in shares) 145,175 136,000
Outstanding, weighted average exercise price (in dollars per share) $ 453.71 $ 426.80
Outstanding, Beginning Balance, weighted average fair value (in dollars per share) $ 95.01 $ 88.07
Vested and exercisable, stock appreciation rights (in shares) 25,550  
Vested and exercisable, weighted average exercise price (in dollars per share) $ 422.31  
Vested and exercisable, weighted average fair value (in dollars per share) $ 87.22  
Vested and exercisable, aggregate intrinsic value $ 5,165  
Weighted Average Remaining Contractual Term, Vested and exercisable (Year) 8 years 146 days