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Note 8 - Stock Based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) 200,000 200,000   200,000   200,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance (in dollars per share) $ 9.47 $ 9.47   $ 9.47   $ 9.47
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares) 200,000 200,000   200,000    
Share-based Payment Arrangement, Expense   $ 0.3 $ 0.9 $ 1.9 $ 2.7  
Mr. Bressler [Member] | Natural Habitat, Inc [Member]            
Business Combination, Contingent Consideration Arrangements, Financial Performance Target       $ 25.0    
Business Combination, Contingent Consideration Arrangements, Fair Value of Options Granted in Excess of Range of Outcomes High, Percentage       10.10%    
2015 Long-Term Incentive Compensation Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) 2,500,000 2,500,000   2,500,000    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) 1,000,000.0 1,000,000.0   1,000,000.0    
The 2020 Long-Term Incentive Compensation Plan [Member] | Restricted Stock Units (RSUs) [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)       186,515    
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)       $ 6.07    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)       1 year    
The 2020 Long-Term Incentive Compensation Plan [Member] | Restricted Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)       55,048    
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)       $ 8.26    
The 2020 Long-Term Incentive Compensation Plan [Member] | Performance Shares [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)       86,783    
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)       $ 5.42    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Percentage of Total Awards       50.00%    
The 2020 Long-Term Incentive Compensation Plan [Member] | Performance Shares [Member] | Minimum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Earn out Percentage       0.00%    
The 2020 Long-Term Incentive Compensation Plan [Member] | Performance Shares [Member] | Maximum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Earn out Percentage       200.00%    
The 2020 Long-Term Incentive Compensation Plan [Member] | Market Performance Share Units (MSUs) [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 98,030          
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) $ 8.51          
The 2020 Long-Term Incentive Compensation Plan [Member] | Market Performance Share Units (MSUs) [Member] | Share-based Payment Arrangement, Tranche One [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 50.00%          
The 2020 Long-Term Incentive Compensation Plan [Member] | Market Performance Share Units (MSUs) [Member] | Share-based Payment Arrangement, Tranche Two [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 50.00%