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Note 13 - Long-term Incentive Plan (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Jan. 01, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Payment Arrangement, Noncash Expense, Total   $ 973 $ 1,845  
Long-Term Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized   4,100,000    
Long-Term Incentive Plan [Member] | Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   3 years    
Long-Term Incentive Plan [Member] | Restricted Stock [Member] | Director [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 1.07 $ 1.20 $ 4.85
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   7,500 23,436 15,306
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Grant Date Total Fair Value   $ 8 $ 28 $ 74
Long-Term Incentive Plan [Member] | 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%    
Long-Term Incentive Plan [Member] | 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%    
Long-Term Incentive Plan [Member] | 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%    
Long-Term Incentive Plan [Member] | Common Unit [Member] | Director [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 1.20  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     21,875  
Long-Term Incentive Plan [Member] | Common Unit [Member] | Director [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Grant Date Total Fair Value     $ 100  
Long-Term Incentive Plan [Member] | 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   $ 1.13    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   578,665    
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount   $ 900    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period   382,845    
Share-based Payment Arrangement, Noncash Expense, Total   $ 1,100 $ 2,200  
Long-Term Incentive Plan [Member] | 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 227,701