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Note 11 - Stock Transactions and Stock-based Compensation - Performance Stock Unit Activity (Details) - Performance Stock Units [Member] - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Nonvested (in shares) 22    
Nonvested, weighted average grant date fair value per share (in dollars per share) $ 204.68    
Nonvested, weighted average remaining contractual life (Year) 9 months 18 days 1 year 7 months 6 days  
Nonvested, aggregate intrinsic value $ 4,884 $ 4,903  
Awards forfeited or expired (in shares) (2)    
Awards granted, weighted average grant date fair value per share (in dollars per share) $ 228.27 $ 215.47 $ 192.99
Nonvested (in shares) 20 22  
Nonvested, weighted average grant date fair value per share (in dollars per share) $ 207.88 $ 204.68  
Expected to vest (in shares) 34    
Expected to vest, weighted average grant date fair value per share (in dollars per share) $ 195.78    
Expected to vest, weighted average remaining contractual life (Year) 7 months 6 days    
Expected to vest, aggregate intrinsic value $ 8,359