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Note 10 - Long-term Incentive Plan (Details Textual) - Long-Term Incentive Plan [Member] - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)       8,100,000    
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount       $ 3.0    
Share-based Payment Arrangement, Expense       $ 0.2 $ 0.1  
Restricted Stock [Member] | The 2022 Awards [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 3 years          
Restricted Stock [Member] | Share-Based Payment Arrangement, Tranche Two [Member] | The 2022 Awards [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 33.33%          
Restricted Stock [Member] | Share-Based Payment Arrangement, Tranche One [Member] | The 2022 Awards [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 33.33%          
Restricted Stock [Member] | Share-Based Payment Arrangement, Tranche Three [Member] | The 2022 Awards [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 33.33%          
Phantom Share Units (PSUs) [Member] | Share-Based Payment Arrangement, Tranche Two [Member] | The 2022 Awards [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage       33.33%    
Phantom Share Units (PSUs) [Member] | Share-Based Payment Arrangement, Tranche One [Member] | The 2022 Awards [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage       33.33%    
Phantom Share Units (PSUs) [Member] | Share-Based Payment Arrangement, Tranche Three [Member] | The 2022 Awards [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage       33.33%    
Phantom Share Units (PSUs) [Member] | Vesting 100% After Three Years [Member] | The 2020 Awards [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)       3 years    
Phantom Share Units (PSUs) [Member] | Vesting 100% After Three Years [Member] | The 2021 Awards [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)       3 years    
Phantom Share Units (PSUs) [Member] | Vesting 100% After Three Years [Member] | The 2019 Awards [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)       3 years    
Director [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted (in shares) 21,228          
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) $ 3.26          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Grant Date Fair Value, Without Vesting Requirement $ 0.1         $ 0.1
Director [Member] | Restricted Stock [Member]            
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) [1]   $ 2.06 $ 1.07     $ 3.26
[1] Fair value is the closing market price on the grant date of the awards.