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Note 14 - Equity Incentive Plan (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Nov. 04, 2021
Mar. 17, 2021
Jun. 13, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)   1,900,000          
Share-based Payment Arrangement, Expense, Tax Benefit   $ 100,000 $ 200,000 $ 100,000      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value   $ 975,000 $ 2,800,000 $ 8,500,000      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)   529,505          
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term (Year)       3 years 6 months      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)   1,175,993 896,819        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)   $ 38.08 $ 38.20 $ 34.02      
Premium-Priced Employee Stock Options [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Premium Priced Options, Exercise Price as Percentage of Market Price   110.00%          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)   323,766          
Share-based Payment Arrangement, Option [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)   10 years          
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total   $ 9,000,000.0          
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)   1 year 10 months 24 days          
Total Shareholder Return ("TSRs") Options [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)   2 years 8 months 12 days          
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term (Year)   6 years 3 months 18 days          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)   104,638          
Restricted Stock Units (RSUs) [Member]              
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total   $ 10,300,000          
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)   1 year 10 months 24 days          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value   $ 3,700,000 $ 2,200,000 $ 600,000      
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)   $ 35.88          
Performance Shares [Member]              
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total   $ 100,000          
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)   2 months 12 days          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value   $ 0 $ 0 $ 0      
Share-based Compensation, Performance Shares Measured by Business Targets   20.00%   30.00%      
Share-based Compensation, Performance Shares Measured by Financial Targets   55.00% 60.00% 15.00%      
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)     $ 36.93 $ 33.05      
Selling, General and Administrative Expenses [Member]              
Share-based Payment Arrangement, Expense, Tax Benefit $ 1,800,000            
Minimum [Member] | Share-based Payment Arrangement, Option [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)   3 years          
Minimum [Member] | Total Shareholder Return ("TSRs") Options [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Target Number   0.00%          
Minimum [Member] | Restricted Stock Units (RSUs) [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)   3 years          
Minimum [Member] | Performance Shares [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)   3 years          
Maximum [Member] | Share-based Payment Arrangement, Option [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)   4 years          
Maximum [Member] | Total Shareholder Return ("TSRs") Options [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Target Number   150.00%          
Maximum [Member] | Restricted Stock Units (RSUs) [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)   4 years          
The 2017 Plan [Member]              
Number of Shares Available for Grant Reduced By Each Share Award Issued Other Than Options or SARs (in shares)             2
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)             4,600,000
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)   10 years          
The 2017 Plan [Member] | Minimum [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)   1 year          
The 2017 Plan [Member] | Maximum [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)   4 years          
The 2021 Inducement Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)   123,463          
Common Stock, Capital Shares Reserved for Future Issuance (in shares)         125,000    
Employee Stock Purchase Plan (ESPP) [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)           200,000  
Share Based Compensation Arrangement by Share Based Payment Award Number of Shares Authorized per Offering Period (in shares)           800  
Share Based Compensation Arrangement by Share Based Payment Award, Value Authorized           $ 25,000  
Represents Share Based Compensation Arrangement by Share Based Payment Award, Payroll Deduction percentage           10.00%  
Represents Share Based Compensation Arrangement by Share Based Payment Award, the Purchase Price for Each Share Purchased, Percentage           85.00%