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Note 9 - Stock Transactions and Stock-based Compensation - Performance Stock Unit Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Nonvested, weighted average remaining contractual life (Year) 4 years 3 months 18 days    
Nonvested, aggregate intrinsic value $ 14,093    
Nonvested (in shares) 55    
Nonvested, weighted average grant date fair value per share (in dollars per share) $ 288.45    
Expected to vest, number of shares (in shares) 53    
Expected to vest, weighted average grant date fair value per share (in dollars per share) $ 283.88    
Expected to vest, weighted average remaining contractual life (Year) 2 years 9 months 18 days    
Expected to vest, aggregate intrinsic value $ 13,531    
Performance Stock Units [Member]      
Nonvested (in shares) 20    
Nonvested, weighted average grant date fair value per share (in dollars per share) $ 207.88    
Nonvested, weighted average remaining contractual life (Year)   9 months 18 days  
Nonvested, aggregate intrinsic value   $ 4,884  
Awards granted (in shares) 48 0  
Awards granted, weighted average grant date fair value per share (in dollars per share) $ 302.15   $ 215.47
Performance adjustment (in shares) [1] 16    
Awards distributed (in shares) (29) 0 0
Awards distributed, weighted average grant date fair value per share (in dollars per share) $ 197.81    
Nonvested (in shares)   20  
Nonvested, weighted average grant date fair value per share (in dollars per share)   $ 207.88  
[1] During the quarter ended June 30, 2021, the fiscal year 2019 PSUs vested and were paid at 280% of target, based on actual performance results and completion of service conditions. In addition, the PSUs granted to employees of Gyros Protein Technologies Holding AB vested at 60% of target, following a modification of the performance targets by the Compensation Committee of the Board of Directors during fiscal year 2021.