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Note 3 - Stock-based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended
Jun. 11, 2020
Feb. 28, 2025
Mar. 31, 2025
Mar. 31, 2024
Nov. 13, 2014
Share Price (in dollars per share)   $ 656.29 $ 579.98    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount       $ 355.9  
Restricted Stock Units (RSUs) [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested     $ 31.0 $ 403.0  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding     $ 1,100.0    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)     2 years    
Time-Based RSUs [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)     23,000    
Time-Based RSUs [Member] | Employees [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)     23,000    
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)     4 years    
Time-Based RSUs [Member] | Director [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)     1 year    
PSU 2025 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Price Per Share Payable Upon Vesting of Equity Instruments Other than Options (in dollars per share)     $ 30    
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term (Year)     3 years    
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate     54.42%    
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate     4.20%    
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate     0.95%    
PSU 2025 [Member] | Minimum [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Correlation Coefficient     0.46    
PSU 2025 [Member] | Maximum [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Correlation Coefficient     0.76    
PSU 2025 [Member] | Executive Officer [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)   50,000      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Maximum Percentage Allowed, First Goal   300.00%      
Maximum Stock Compensation Costs   $ 138.5      
PSU 2025 [Member] | Executive Officer [Member] | Share-Based Payment Arrangement, Tranche Two [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Maximum Percentage Allowed, Second Goal   200.00%      
PSU 2025 [Member] | Non-Executive Employees [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)   11,000      
Maximum Stock Compensation Costs   $ 16.7      
PSU 2025 [Member] | Non-Executive Employees [Member] | Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Minimum Percentage Allowed   200.00%      
PSU 2025 [Member] | Non-Executive Employees [Member] | Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Maximum Percentage Allowed   300.00%      
PSU 2025 [Member] | Non-Executive Employees [Member] | Vesting First Quarter of 2027 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   50.00%      
The2014 Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)         5,500,000
Amended and Restated 2014 Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares) 10,500,000        
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)     3,600,000