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Note 6 - Equity (Details)
3 Months Ended 6 Months Ended
Feb. 23, 2022
shares
Aug. 31, 2016
employee
$ / shares
shares
Jun. 30, 2022
USD ($)
$ / shares
shares
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
$ / shares
shares
Jun. 30, 2021
USD ($)
Dec. 31, 2021
$ / shares
shares
EQUITY              
Authorized (in shares)     10,900,000   10,900,000    
Shares available for grant     5,400,000   5,400,000    
Additional shares authorized 4,000,000.0            
Compensation costs | $     $ 2,300,000 $ 1,500,000 $ 4,200,000 $ 2,600,000  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract]              
Options granted   937,424          
Option exercise price (per share) | $ / shares   $ 5.34          
Options outstanding, intrinsic value | $     $ 7,300,000   $ 7,300,000    
Common stock, shares authorized (in shares)     260,000,000   260,000,000   260,000,000
Common stock, par value (in dollars per share) | $ / shares     $ 0.01   $ 0.01   $ 0.01
Preferred stock, shares authorized (in shares)     50,000,000   50,000,000   50,000,000
Preferred stock, par value (in dollars per share) | $ / shares     $ 0.01   $ 0.01   $ 0.01
Options              
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract]              
Number of Executives | employee   2          
Expiration period   10 years          
Restricted Stock              
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract]              
Outstanding, Weighted average grant date fair value (in dollars per share) | $ / shares     $ 4.33   $ 4.33    
Unrecognized compensation cost | $     $ 8,100,000   $ 8,100,000    
Weighted-average period for recognition         1 year 3 months 18 days    
Outstanding, shares (in shares)     3,206,512   3,206,512    
Restricted Stock | Minimum              
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract]              
Vesting period         1 year    
Restricted Stock | Maximum              
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract]              
Vesting period         3 years 6 months    
Restricted Stock Units              
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract]              
Vesting period         3 years    
Amount of dividend equivalents awarded | $         $ 0    
Outstanding, Weighted average grant date fair value (in dollars per share) | $ / shares     $ 15.65   $ 15.65    
Unrecognized compensation cost | $     $ 3,300,000   $ 3,300,000    
Weighted-average period for recognition         2 years 6 months    
Outstanding, shares (in shares)     248,706   248,706    
Delivery Period         30 days    
Shares delivered per unit awarded         1    
Performance Stock Units              
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract]              
Vesting period         3 years    
Amount of dividend equivalents awarded | $         $ 0    
Outstanding, Weighted average grant date fair value (in dollars per share) | $ / shares     $ 22.21   $ 22.21    
Unrecognized compensation cost | $     $ 4,700,000   $ 4,700,000    
Weighted-average period for recognition         2 years 6 months    
Outstanding, shares (in shares)     248,706   248,706    
Delivery Period         30 days    
Shares delivered per unit awarded         1    
Share price for peer companies | $ / shares     $ 15.65   $ 15.65    
Performance Stock Units | Minimum              
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract]              
Potential earnings (as a percentage)         0.00%    
Performance Stock Units | Maximum              
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract]              
Potential earnings (as a percentage)         200.00%