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Note 13 - Long-term Incentive Plan (Details Textual) - Long-Term Incentive Plan [Member] - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Jan. 01, 2022
Dec. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)   8,100,000 8,100,000    
Share-based Payment Arrangement, Expense     $ 0.8 $ 0.8  
Restricted Stock [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]          
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]          
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]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage     33.33%    
Phantom and Restricted Units Holders [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)     $ 2.75    
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount   $ 1.1 $ 1.1    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)     369,482    
Phantom and Restricted Units Holders [Member] | Subsequent Event [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares) 426,297        
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)     $ 3.26 $ 2.06 $ 1.07