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Note 10 - Stockholders' Equity and Stock Incentive Plans (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Feb. 03, 2022
Dec. 31, 2021
Apr. 30, 2020
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Oct. 21, 2021
Mar. 16, 2020
Dec. 12, 2018
Stock Repurchased and Retired During Period, Shares (in shares) [1],[2]             1,310,000 683,000 1,087,000      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value             $ 17,900 $ 5,700 $ 4,700      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value               0 $ 600      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total   $ 0         0 $ 0        
Restricted Stock Units (RSUs) [Member]                        
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total   6,600         $ 6,600          
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)             1 year 8 months 12 days          
Performance Shares [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)             3 years          
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total   $ 2,600         $ 2,600          
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)   1 year 4 months 24 days                    
Share Based Compensation Arrangement By Share Based Payment Award, Evaluation of Performance Conditions Period (Year)             3 years          
Share Based Compensation Arrangement By Share Based Payment Award, Awards if Only Threshhold Performance Met, Percentage             50.00%          
Share Based Compensation Arrangement By Share Based Payment Award, Awards for Target Performance, Percentage             100.00%          
Share Based Compensation Arrangement By Share Based Payment Award, Awards for Maximum Performance, Percentage             200.00%          
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period (in shares)       90,444 364,810 395,964            
Shares Issued Per Unit (in shares)       0.33 1.53 1.67            
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares)       30,129 126,465 125,004            
Share Based Payment Arrangement, Shares Issued In Period, Net of Tax Withholdings (in shares)       60,315 238,345 270,960            
Shares to be Issued to Settle PSUs (in shares)             1.0          
Career Shares [Member]                        
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total   $ 1,400         $ 1,400          
Career Shares [Member] | Executive Officer [Member]                        
Share Based Compensation Arrangement By Share Based Payment Award, Award Eligibility Minimum Age (Year)               55 years        
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period (Year)             10 years          
Career Shares [Member] | Executive Officer [Member] | Share-based Payment Arrangement, Tranche One [Member]                        
Share Based Compensation Arrangement By Share Based Payment Award, Service Period (Year)             10 years          
Career Shares [Member] | Executive Officer [Member] | Share-based Payment Arrangement, Tranche Two [Member]                        
Share Based Compensation Arrangement By Share Based Payment Award, Service Period (Year)             15 years          
Career Shares [Member] | Executive Officer [Member] | Share-based Payment Arrangement, Tranche Three [Member]                        
Share Based Compensation Arrangement By Share Based Payment Award, Service Period (Year)             20 years          
The 2020 Plan [Member]                        
Share Based Compensation Arrangement By Share Based Payment Award Expiration of Plan (Year)     10 years                  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)               3,300,000        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)   7,400,000         7,400,000          
Common Stock, Capital Shares Reserved for Future Issuance (in shares)   10,500,000         10,500,000          
The 2020 Plan [Member] | Share-based Payment Arrangement, Option [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)               3 years        
Subsequent Event [Member]                        
Common Stock, Dividends, Per Share, Declared (in dollars per share) $ 0.15                      
Dividends Payable, Date Declared Feb. 03, 2022                      
Dividends Payable, Date to be Paid Apr. 15, 2022                      
Dividends Payable, Date of Record Mar. 15, 2022                      
The 2018 Plan [Member]                        
Stock Repurchase Program, Authorized Amount                       $ 100,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount                     $ 61,400  
The 2021 Program [Member]                        
Stock Repurchase Program, Authorized Amount                   $ 300,000    
Stock Repurchase Program, Remaining Authorized Repurchase Amount   $ 280,600         $ 280,600          
[1] All shares repurchased have been retired and constitute authorized but unissued shares.
[2] Shares repurchased reflect repurchases settled during the twelve months ended December 31, 2021, 2020 and 2019. These amounts exclude repurchases, if any, traded but not yet settled on or before December 31, 2021, 2020 and 2019.