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Note 9 - Stock Transactions and Stock-based Compensation - Stock Option and Non-vested Stock Award Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Options outstanding (in shares) 253    
Options outstanding, weighted average exercise price (in dollars per share) $ 129.55    
Outstanding, Weighted- Average Remaining Contractual Life (Year) 2 years 10 months 24 days 2 years 8 months 12 days  
Outstanding, Aggregate Intrinsic Value $ 18,261 $ 28,856  
Options granted (in shares) 37    
Awards granted, weighted average exercise price (in dollars per share) $ 268,810 $ 226.72 $ 206.35
Options forfeited or expired (in shares) (4)    
Awards forfeited or expired, weighted average exercise price (in dollars per share) $ 191,520    
Options exercised or distributed (in shares) (84)    
Awards exercised or distributed, weighted average exercise price (in dollars per share) $ 96,680    
Options outstanding (in shares) 202    
Options outstanding, weighted average exercise price (in dollars per share) $ 167.14    
Options exercisable (in shares) 100    
Exercisable, weighted average exercise price (in dollars per share) $ 128,320    
Exercisable, Weighted- Average Remaining Contractual Life (Year) 1 year 10 months 24 days    
Exercisable, Aggregate Intrinsic Value $ 12,636    
Exercisable and expected to vest (in shares) 199    
Exercisable and expected to vest, weighted average exercise price (in dollars per share) $ 174.79    
Exercisable and expected to vest, Weighted- Average Remaining Contractual Life (Year) 3 years    
Exercisable and expected to vest, Aggregate Intrinsic Value $ 18,357