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Note 9 - Stockholders' Equity and Stock-based Compensation (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 08, 2022
Oct. 28, 2021
Jun. 09, 2021
Apr. 27, 2021
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Share-Based Payment Arrangement, Expense         $ 12,820 $ 8,553 $ 24,565 $ 46,755  
Share-Based Payment Arrangement, Accelerated Cost               $ 27,300  
Stock Repurchased and Retired During Period, Shares (in shares)             929,000 585,000  
Stock Repurchased and Retired During Period, Value             $ 117,800 $ 63,300  
Stock Repurchase Program, Remaining Authorized Repurchase Amount         354,000   354,000    
Share-Based Payment Arrangement, Option [Member]                  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total         19,700   $ 19,700    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)             2 years 9 months 18 days    
Restricted Stock Units (RSUs) [Member]                  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total         70,000   $ 70,000    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)             2 years 8 months 12 days    
Share-Based Payment Arrangement, Expense         1,100     $ 1,900  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)             190,000    
Restricted Stock Units (RSUs) [Member] | Performance Shares [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   33.33%              
Share-Based Compensation, Percentage Of Shares That Will Vest Upon Trigger   100.00%              
Performance-based Restricted Stock Units [Member]                  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total         4,000   $ 4,000    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)             1 year 10 months 24 days    
Performance-based Restricted Stock Units [Member] | Executive Officer [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)   73,000              
Share-Based Compensation, Percentage Of Shares That Will Vest Upon Trigger   100.00%              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)   3 years              
Share-based Compensation Termination Period Trigger (Month)   12 months              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)                 34,000
Performance-based Restricted Stock Units [Member] | President and Chief Executive Officer [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)       9,671          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)       3 years          
ESPP Shares [Member]                  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total         $ 200   $ 200    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)             1 month 6 days    
Minimum [Member] | Restricted Stock Units (RSUs) [Member] | Performance Shares, Tranche Three [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Target Percentage   0.00%              
Minimum [Member] | Performance-based Restricted Stock Units [Member] | President and Chief Executive Officer [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Target Percentage       0.00%          
Maximum [Member] | Restricted Stock Units (RSUs) [Member] | Performance Shares, Tranche Three [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Target Percentage   200.00%              
Maximum [Member] | Performance-based Restricted Stock Units [Member] | President and Chief Executive Officer [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Target Percentage       200.00%          
The 2012 Equity Incentive Plan [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized (in shares) 3,072,000                
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)         3,089,000   3,089,000    
The 2021 Employee Stock Purchase Plan [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)         577,500   577,500    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)     600,000            
Share-based Compensation Arrangement by Share-based Payment Award, Offering Period (Month)     6 months            
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent     85.00%            
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares)             22,500    
The 2021 Employee Stock Purchase Plan [Member] | Minimum [Member]                  
Employee Stock Purchase Plan, Percentage of Eligible Compensation Contributable     1.00%            
The 2021 Employee Stock Purchase Plan [Member] | Maximum [Member]                  
Employee Stock Purchase Plan, Percentage of Eligible Compensation Contributable     15.00%