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Note 7 - Stock-based Compensation (Details Textual)
$ / shares in Units, $ in Thousands
 1 Months Ended 2 Months Ended 3 Months Ended 12 Months Ended
Jun. 11, 2020
shares
Dec. 31, 2015
USD ($)
shares
Apr. 30, 2023
shares
Feb. 28, 2023
USD ($)
shares
Oct. 31, 2022
USD ($)
$ / shares
shares
Feb. 28, 2022
USD ($)
$ / shares
shares
Feb. 28, 2021
USD ($)
$ / shares
shares
Jul. 31, 2020
USD ($)
$ / shares
shares
Feb. 29, 2020
USD ($)
$ / shares
shares
Oct. 31, 2018
$ / shares
shares
Dec. 31, 2013
$ / shares
shares
Feb. 28, 2023
Mar. 31, 2022
Dec. 31, 2023
USD ($)
$ / shares
shares
Dec. 31, 2022
USD ($)
$ / shares
shares
Dec. 31, 2021
USD ($)
$ / shares
shares
Dec. 31, 2020
shares
Dec. 31, 2019
USD ($)
shares
Nov. 13, 2014
shares
Share Price (in dollars per share) | $ / shares           $ 393.16 $ 374.57             $ 630.78          
Proceeds, Issuance of Shares, Share-Based Payment Arrangement, Excluding Option Exercised | $                           $ 1,118 $ 5,358 $ 17,322      
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)                           363,000 1,001,000 411,000      
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) | $ / shares                           $ 444.86 $ 215.63 $ 357.49      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)                           911,000 837,000 972,000      
Share-based Payment Arrangement, Expense | $                           $ 149,711 $ 160,992 $ 123,479      
Proceeds from Stock Plans | $                           7,568 5,877 4,670      
Restricted Stock Units (RSUs) [Member]                                      
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested | $                           461,300 336,800 381,200      
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding | $                           1,300,000          
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $                           $ 232,600          
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)                           2 years          
Proceeds, Issuance of Shares, Share-Based Payment Arrangement, Excluding Option Exercised | $                           $ 1,100 $ 5,400 $ 17,300      
Time-Based RSUs [Member]                                      
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)                           51,000 49,000 46,000      
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) | $ / shares                           $ 472.38 $ 390.89 $ 384.33      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)                           49,000 61,000 71,000      
Time-Based RSUs [Member] | Employees [Member]                                      
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               1 year 1 year        
PSU2023 [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) | $ / shares                           $ 30          
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) | $ / shares                           $ 467.62          
Total number of performance conditions                           4          
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate                           51.00%          
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate                           3.90%          
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate                           0.90%          
PSU2023 [Member] | Executive Officer [Member]                                      
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)       69,000                              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Maximum Percentage Allowed           300.00%                          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Minimum Percentage Allowed                           200.00%          
Maximum Stock Compensation Costs | $                           $ 156,200          
PSU2023 [Member] | Non-Executive Employees [Member]                                      
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)       13,000                              
Maximum Stock Compensation Costs | $       $ 13,800                              
PSU2023 [Member] | Non-Executive Employees [Member] | Vesting First Quarter of 2025 [Member]                                      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage                       50.00%              
PSU2023 [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%              
PSU2023 [Member] | Non-Executive Employees [Member] | Maximum [Member]                                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Minimum Percentage Allowed                       300.00%              
PSU 2022 [Member]                                      
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $         $ 102,800                            
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) | $ / shares           $ 30                          
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) | $ / shares           $ 393.16                          
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate           44.60%                          
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate           1.50%                          
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate           0.80%                          
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term (Year)           4 years                          
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Discount for Postvesting Restrictions           10.30%                          
PSU 2022 [Member] | Executive Officer [Member]                                      
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)           81,000                          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Maximum Percentage Allowed           300.00%                          
PSU 2022 [Member] | Executive Officer [Member] | Vesting First Quarter of 2023 if Performance Conditions are Met [Member]                                      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage           50.00%                          
PSU 2022 [Member] | Non-Executive Employees [Member]                                      
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)           14,000                          
Maximum Stock Compensation Costs | $           $ 142,700                          
Share-based Compensation Arrangement by Share-based Payment Award, Vesting, Measurement Period of Relative Revenue Growth Rate to Industry Average (Year)                         2 years            
PSU 2022 [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 2020 [Member]                                      
Share Price (in dollars per share) | $ / shares                 $ 182.62                    
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) | $ / shares                 30                    
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) | $ / shares                 $ 182.62                    
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate                 33.60%                    
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate                 1.40%                    
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate                 1.10%                    
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term (Year)                 2 years                    
PSU 2020 [Member] | Executive Officer [Member]                                      
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)                 100,000             300,000      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Maximum Percentage Allowed                 300.00%                    
Maximum Stock Compensation Costs | $                 $ 51,100                    
Share-based Compensation Arrangement by Share-based Payment Award, Vesting, Measurement Period of Relative Revenue Growth Rate to Industry Average (Year)                 2 years                    
PSU 2020 [Member] | Executive Officer [Member] | Vesting First Quarter of 2022 if Performance Conditions are Met [Member]                                      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage                 50.00%                    
PSU 2020 [Member] | Non-Executive Employees [Member]                                      
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)                 30,000             71,000      
Maximum Stock Compensation Costs | $           $ 11,100     $ 11,800                    
Share-based Compensation Arrangement by Share-based Payment Award, Vesting, Measurement Period of Relative Revenue Growth Rate to Industry Average (Year)           2 years     2 years                    
PSU 2020 [Member] | Non-Executive Employees [Member] | Vesting First Quarter of 2021 if Performance Conditions are Met [Member]                                      
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)           29,000                          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage           50.00%     50.00%                    
PSU 2020 [Member] | Non-Executive Employees [Member] | Annual or Quarterly Vesting of Awards Not Based on Performance [Member]                                      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)           2 years     2 years                    
PSU 2020 [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%     200.00%                    
PSU 2020 [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%     300.00%                    
PSU 2021 [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) | $ / shares             30                        
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) | $ / shares             $ 374.57                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate             41.40%                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate             0.30%                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate             0.60%                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term (Year)             4 years                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Discount for Postvesting Restrictions             9.80%                        
PSU 2021 [Member] | Executive Officer [Member]                                      
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)             80,000                        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Maximum Percentage Allowed             300.00%                        
Maximum Stock Compensation Costs | $             $ 114,400                        
Share-based Compensation Arrangement by Share-based Payment Award, Vesting, Measurement Period of Relative Revenue Growth Rate to Industry Average (Year)             2 years                        
PSU 2021 [Member] | Executive Officer [Member] | Vesting First Quarter of 2023 if Performance Conditions are Met [Member]                                      
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)             240,000                        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage             50.00%                        
PSU 2021 [Member] | Non-Executive Employees [Member]                                      
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)             14,000                        
Maximum Stock Compensation Costs | $             $ 11,900                        
Share-based Compensation Arrangement by Share-based Payment Award, Vesting, Measurement Period of Relative Revenue Growth Rate to Industry Average (Year)             2 years                        
PSU 2021 [Member] | Non-Executive Employees [Member] | Vesting First Quarter of 2021 if Performance Conditions are Met [Member]                                      
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)             33,000                        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage             50.00%                        
PSU 2021 [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 2021 [Member] | Non-Executive Employees [Member] | Maximum [Member]                                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Minimum Percentage Allowed             300.00%                        
MPSUs 2020 [Member]                                      
Share Price (in dollars per share) | $ / shares                               $ 248.71      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Maximum Percentage Allowed               500.00%                      
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate                               38.80%      
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate                               0.20%      
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate                               0.80%      
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term (Year)                               4 years      
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Discount for Postvesting Restrictions                               8.90%      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Price Targets               5                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)                                 221,000    
Share-based Payment Arrangement, Expense | $               $ 42,100                      
MPSUs 2020 [Member] | Vest on July, 2023 [Member]                                      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage               75.00%                      
MPSUs 2020 [Member] | Vest on July 20, 2024 [Member]                                      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage               25.00%                      
MPSUs 2020 [Member] | Minimum [Member]                                      
Share Based Compensation Arrangement By Share Based Payment Award, Stock Price Target (in dollars per share) | $ / shares               $ 260                      
MPSUs 2020 [Member] | Maximum [Member]                                      
Share Based Compensation Arrangement By Share Based Payment Award, Stock Price Target (in dollars per share) | $ / shares               $ 300                      
MPSUs 2020 [Member] | Executive Officer [Member]                                      
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)               43,000                      
MPSUs 2020 [Member] | Key Employees [Member]                                      
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)               2,000                      
MSUs 2022 [Member]                                      
Share Price (in dollars per share) | $ / shares         $ 342.16 $ 393.16                          
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)         159,000                            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Maximum Percentage Allowed         500.00% 500.00%                          
Maximum Stock Compensation Costs | $         $ 119,200 $ 30,100               $ 124,300          
Total number of performance conditions           6                          
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate         54.00% 39.00%                          
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate         4.40% 1.70%                          
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate         0.90% 0.80%                          
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, Number of Price Targets           5                          
Share-Based Payment Arrangement, Plan Modification, Incremental Cost | $         $ 21,500                            
MSUs 2022 [Member] | Share-Based Payment Arrangement, Tranche One [Member]                                      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Price Targets         5                            
MSUs 2022 [Member] | Minimum [Member]                                      
Market Awards Price Targets (in dollars per share) | $ / shares         $ 455 $ 472                          
MSUs 2022 [Member] | Maximum [Member]                                      
Market Awards Price Targets (in dollars per share) | $ / shares         $ 591 $ 590                          
MSUs 2022 [Member] | Executive Officer [Member]                                      
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)           24,000                          
MSUs 2018 [Member]                                      
Share Price (in dollars per share) | $ / shares                   $ 108.43                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)                                   600,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Maximum Percentage Allowed                   500.00%                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate                   31.60%                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate                   3.00%                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Discount for Postvesting Restrictions                   8.70%                  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Price Targets                   5                  
Share-based Payment Arrangement, Expense | $                                   $ 38,500  
Share-based Compensation Arrangement by Share-based Payment Award, Post-Award Vesting Period, Restriction Period on Sales (Year)                   2 years                  
MSUs 2018 [Member] | Minimum [Member]                                      
Market Awards Price Targets (in dollars per share) | $ / shares                   $ 140                  
MSUs 2018 [Member] | Maximum [Member]                                      
Market Awards Price Targets (in dollars per share) | $ / shares                   $ 172                  
MSUs 2018 [Member] | Executive Officer [Member]                                      
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)                   60,000                  
MSUs 2018 [Member] | Non-Executive Employees [Member]                                      
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)                   60,000                  
2013 MSU's [Member]                                      
Share Price (in dollars per share) | $ / shares                     $ 31.73                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Maximum Percentage Allowed                     500.00%                
Maximum Stock Compensation Costs | $   $ 38,100                                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate                     38.70%                
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate                     1.60%                
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Discount for Postvesting Restrictions                     0.00%                
Share-based Compensation Arrangement by Share-based Payment Award, Number of Price Targets                     5                
Total MSUs Earned (in shares)   1,800,000                                  
2013 MSU's [Member] | Minimum [Member]                                      
Market Awards Price Targets (in dollars per share) | $ / shares                     $ 40                
2013 MSU's [Member] | Maximum [Member]                                      
Market Awards Price Targets (in dollars per share) | $ / shares                     $ 56                
2013 MSU's [Member] | Executive Officer [Member]                                      
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)                     276,000                
2013 MSU's [Member] | Non-Executive Employees [Member]                                      
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)                     84,000                
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)                           4,200,000          
Employee Stock Purchase Plan [Member]                                      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)     4,400,000                                
Share-based Compensation Arrangement by Share-based Payment Award, Automatic Increase Shares (in shares)     1,000,000                                
Share-basedCompensation Arrangement by Share-based Payment Award, Other Than Options, Percent Increases in Period     2.00%                                
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares Per Employee (in shares)                           2,000          
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares per Employee Value (in shares)                           25,000          
The 2004 Employee Stock Purchase Plan [Member]                                      
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)                           4,400,000          
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $                           $ 400          
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares)                           17,000 14,000 17,000      
Employee Stock Purchase Plan Shares Issued, Intrinsic Value | $                           $ 1,400 $ 1,600 $ 2,400      
Proceeds from Stock Plans | $                           $ 7,600 $ 5,900 $ 4,700