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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, 2023
Mar. 31, 2022
Mar. 31, 2021
Nonvested, weighted average remaining contractual life (Year) 3 years 6 months    
Nonvested, aggregate intrinsic value $ 7,958    
Nonvested (in shares) 44    
Nonvested, weighted average grant date fair value per share (in dollars per share) $ 286.02    
Expected to vest (in shares) 42    
Expected to vest, weighted average grant date fair value per share (in dollars per share) $ 287.48    
Expected to vest, weighted average remaining contractual life (Year) 3 years 4 months 24 days    
Expected to vest, aggregate intrinsic value $ 7,306    
Performance Stock Units [Member]      
Nonvested (in shares) 55    
Nonvested, weighted average grant date fair value per share (in dollars per share) $ 288.45    
Nonvested, weighted average remaining contractual life (Year)   4 years 3 months 18 days  
Nonvested, aggregate intrinsic value   $ 14,093  
Awards granted (in shares) 19   0
Awards granted, weighted average grant date fair value per share (in dollars per share) $ 182.14 $ 302.15  
Performance adjustment (in shares) [1] (20)    
Awards distributed (in shares) (10)    
Awards distributed, weighted average grant date fair value per share (in dollars per share) $ 202.00    
Nonvested (in shares)   55  
Nonvested, weighted average grant date fair value per share (in dollars per share)   $ 288.45  
[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.