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Note 3 - Significant Accounting Policies (Details Textual)
$ / shares in Units, $ in Thousands
1 Months Ended 9 Months Ended 12 Months Ended
Mar. 16, 2018
$ / shares
shares
Mar. 31, 2019
$ / shares
shares
Sep. 30, 2019
USD ($)
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
$ / shares
shares
Number of Operating Segments       2    
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount | $       $ 1,400 $ 800  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition     1 year 73 days      
Percent of Distributed Dividends Equal to Taxable REIT Income     90.00%      
Income Tax Expense (Benefit), Total | $     $ 0      
Derivative, Amount of Hedged Item | $     $ 0      
Weighted Average Number Diluted Shares Outstanding Adjustment, Total     0      
Percentage of Rental Revenue Subject to New Revenue Recognition Standard       2.00% 2.00% 2.00%
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       158,534 71,112 151,853
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares       $ 13.33 $ 9 $ 11.15
LTIP Units [Member] | Non-employee Director [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 16,667 45,039        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares $ 9 $ 13.35