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Principal Activity and Significant Accounting Policies - Held for Sale and Unconsolidated Affiliates (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2020
USD ($)
ft²
item
property
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
property
Significant Accounting Policies      
Number of real estate properties classified as held for sale | property 0   0
Impairment losses related to the unconsolidated affiliates $ 0 $ 0  
Total assets held by unconsolidated affiliates 34,285   $ 31,261
Mortgage notes held by unconsolidated affiliates 21,878   16,690
Assets $ 718,675   699,686
Operating Partnership | Grand Forks Marketplace Retail Center      
Significant Accounting Policies      
Investment in unconsolidated affiliates 50.00%    
Percentage of interest 100.00%    
Area of commercial property | ft² 183,000    
Operating Partnership | Tenant in common - Office building, Fargo, North Dakota      
Significant Accounting Policies      
Investment in unconsolidated affiliates 66.67%    
Area of commercial property | ft² 75,000    
Operating Partnership | SE Savage      
Significant Accounting Policies      
Number of units | property 190    
Investment in unconsolidated affiliates 60.00%    
Assets $ 12,407    
Cash contribution $ 3,305    
Operating Partnership | SE Maple Grove      
Significant Accounting Policies      
Number of units | property 160    
Investment in unconsolidated affiliates 60.00%    
Assets $ 4,100    
Cash contribution 2,461    
Mortgages | SE Savage      
Significant Accounting Policies      
Mortgage carrying amount 5,407   0
Mortgages | SE Maple Grove      
Significant Accounting Policies      
Mortgage carrying amount 0    
Mortgages | Grand Forks Marketplace Retail Center      
Significant Accounting Policies      
Mortgage carrying amount 10,140   10,264
Mortgages | Tenant in common - Office building, Fargo, North Dakota      
Significant Accounting Policies      
Mortgage carrying amount $ 6,331   $ 6,426
Glen Pond Development      
Significant Accounting Policies      
Number of units | item 114    
Development project budget $ 16,175    
Development project cost incurred 15,698    
Goldmark Office Park      
Significant Accounting Policies      
Development project budget 6,674    
Development project cost incurred $ 5,266