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Note 11 - Equity Incentive Plan (Details Textual) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2021
Nov. 04, 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 Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) 493,628    
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 $ 10.0    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) 1 year 10 months 24 days    
Premium-Priced Employee Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) 314,541    
Share-based Compensation Arrangement by Share-based Payment Award, Premium Priced Options, Exercise Price as Percentage of Market Price 110.00%    
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    
Restricted Stock Units (RSUs) [Member]      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total $ 11.3    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) 2 years 1 month 6 days    
Performance Shares [Member]      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total $ 0.1    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) 4 months 24 days    
Share-based Compensation, Performance Shares Measured by Business Targets 40.00%    
Share-based Compensation, Performance Shares Measured by Financial Targets 60.00%    
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    
Maximum [Member] | Performance Shares [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] | Subsequent Event [Member]      
Common Stock, Capital Shares Reserved for Future Issuance (in shares)   125,000