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Note 9 - Stock Transactions and Stock-based Compensation (Details Textual) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended 208 Months Ended
Oct. 28, 2021
Jun. 12, 2020
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2023
Nov. 30, 2005
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares)                 300
Stock Repurchased During Period, Value         $ 0 $ 0 $ 0    
Stock Repurchased During Period, Shares (in shares)               162  
Stock Issued During Period, Shares, New Issues (in shares)   600              
Sale of Stock, Underwriter Options, Shares (in shares)   90              
Shares Issued, Price Per Share (in dollars per share)   $ 225.00              
Proceeds from Issuance of Common Stock   $ 145,935     0 0 145,935    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value         6,902 15,209 9,559    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested in Period, Fair Value         $ 2,763 $ 2,856 $ 2,005    
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)         $ 185,600 $ 268.81 $ 226.72    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested and Expected to Vest, Outstanding, Number (in shares)     42   42     42  
Share-Based Payment Arrangement, Option [Member]                  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount     $ 2,835   $ 2,835     $ 2,835  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)         1 year 8 months 12 days        
Restricted Stock Units (RSUs) [Member]                  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount     6,893   $ 6,893     6,893  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)         1 year 9 months 18 days        
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)           $ 274.55 $ 231.61    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value         $ 6,751 $ 5,320 $ 1,819    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Distributed         5,004 $ 5,320 2,429    
Performance Stock Units [Member]                  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount     7,642   $ 7,642     $ 7,642  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)         3 years 4 months 24 days        
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)         $ 182.14 $ 302.15      
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value         $ 1,926 $ 5,671      
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Distributed         $ 1,776 $ 7,549 $ 0    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)         19   0    
Sharebased Payment Arrangement, Expected to Vest Share, Release of Cumulative Value         $ 1,787        
Sharebased Payment Arrangement, Expected to Vest Share, Release of Cumulative Value, Net of Tax         $ 1,322        
Sharebased Payment Arrangement, Expected to Vest Share, Release of Cumulative Value, Per Share, Basic (in dollars per share)         $ 0.25        
Share-Based Payment Arrangement, Non-cash Expense, Expected Decrease Amount Per Quarter     $ 402            
Sharebased Payment Arrangement, Expected to Vest Share, Release of Cumulative Value, Per Share, Diluted (in dollars per share)         $ 0.25        
Performance Stock Units [Member] | Employees of Agena [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)           7      
Performance Stock Units [Member] | Chief Executive Officer and Board Director [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted (in shares) 40                
Share Based Compensation Arrangement By Share Based Payment Award, Non Option Equity Instruments, Performance Period Granted (Year) 3 years                
Share-Based Compensation Arrangement by Share-Based Payment Award, Expected to Vest, Percentage       93.00%          
Performance Stock Units [Member] | Chief Executive Officer and Board Director [Member] | Minimum [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares to be Issued Upon Vesting (in shares) 0                
Performance Stock Units [Member] | Chief Executive Officer and Board Director [Member] | Maximum [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares to be Issued Upon Vesting (in shares) 40                
The FY23 PSUs Member | Eligible Employees [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)     19   19     19  
The FY23 PSUs Member | Eligible Employees [Member] | Vesting Based on Achievement of Specific Performance Criteria [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)         $ 185.57        
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)         13        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested and Expected to Vest, Outstanding, Number (in shares)     0   0     0  
The 2021 Equity Plan [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)     330   330     330  
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)     145   145     145  
Equity Plan 2014 [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)     95   95     95  
Common Stock, Capital Shares Reserved for Future Issuance (in shares)     1,100   1,100     1,100  
Equity Plan 2014 [Member] | Restricted Stock Units (RSUs) [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)         $ 187.21        
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)         43        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested and Expected to Vest, Outstanding, Number (in shares)     53   53     53