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Note 8 - Stock Based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) 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
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares) 150,000    
Share-based Payment Arrangement, Expense $ 0.9 $ 0.8  
Mr. Bressler [Member] | Natural Habitat, Inc [Member]      
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High $ 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    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) 1,200,000    
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) 97,768    
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) $ 4.17    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 1 year    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Percentage of Total Awards 25.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants Deferred in Period, Percentage of Total Awards 75.00%    
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) 56,347    
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) $ 4.17    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 3 years    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Percentage of Total Awards 25.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants Deferred in Period, Percentage of Total Awards 75.00%    
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%