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Note 3 - Significant Accounting Policies (Details Textual)
$ / shares in Units, $ in Thousands
1 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
$ / shares
shares
May 31, 2019
$ / shares
shares
Mar. 31, 2019
$ / shares
shares
Jun. 30, 2019
USD ($)
$ / shares
shares
Jun. 30, 2018
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Number of Operating Segments       2    
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount | $ $ 2,100     $ 2,100   $ 800
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition       1 year 109 days    
Income Tax Expense (Benefit), Total | $       $ 0    
Derivative, Amount of Hedged Item | $ $ 0     $ 0    
Weighted Average Number Diluted Shares Outstanding Adjustment, Total       0 0  
Percentage of Rental Revenue Subject to New Revenue Recognition Standard 5.00%     5.00%    
Class B LLC Units [Member]            
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount       26,317    
LTIP Units [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     152,734      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares     $ 13.35      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance 881,065     881,065   724,448
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Ending Balance | $ / shares $ 12.70     $ 12.70   $ 12.56
LTIP Units [Member] | Chief Financial Officer [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   5,800        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares   $ 12.92        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 5,800