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Real Estate Transactions - Narrative (Details) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 12, 2018 USD ($) ft² apartment | Sep. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Jan. 31, 2017 USD ($) | Mar. 31, 2018 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) property
Business Acquisition [Line Items] |  |  |  |  |  |  |
Payments to acquire real estate |  |  |  |  | $ 3,483,000 | $ 4,557,000 |
Rent expense |  |  |  |  | $ 195,100 | $ 188,100 |
Number of properties purchased | property |  |  |  |  |  |  | 1
Great Eastern Shopping Center |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Proceeds from sale of real estate |  | $ 8,500,000 |  |  |  |  |
Gains (losses) on sales of investment real estate |  | 500,000 |  |  |  |  |
Burtonsville Town Square |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Payments to acquire real estate |  |  |  | $ 76,400,000 |  |  |
Portion of purchase price allocated to land |  |  |  |  |  |  | $ 28,400,000
Portion of purchase price allocated to buildings |  |  |  |  |  |  | 45,800,000
Olney |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Payments to acquire real estate |  |  | $ 3,100,000 |  |  |  |
Rent expense |  |  | $ 56,000 |  |  |  |
Great Eastern Shopping Center |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Second trust financing |  | $ 1,280,000 |  |  |  |  |
Second trust financing, stated interest rate |  | 6.00% |  |  |  |  |
Optional extension period |  | 6 months |  |  |  |  |
7316 Wisconsin Avenue |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Payments to acquire real estate | $ 35,500,000 |  |  |  |  |  |
Property acquisition costs | 700,000 |  |  |  |  |  |
Earnest money deposits | $ 3,500,000 |  |  |  |  |  |
Number of units in real estate property | apartment | 325 |  |  |  |  |  |
7316 Wisconsin Avenue Retail Space |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Area of real estate property (in square feet) | ft² | 10,000 |  |  |  |  |  |
Leases, Acquired-in-Place | Burtonsville Town Square |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Portion of purchase price allocated to leases acquired in place |  |  |  |  |  |  | (2,200,000)
Below Market Leases | Burtonsville Town Square |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Portion of purchase price allocated to leases acquired in place |  |  |  |  |  |  | (600,000)
Below Market Leases | Burtonsville Town Square |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Portion of purchase price allocated to leases acquired in place |  |  |  |  |  |  | $ (600,000)

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