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v3.10.0.1

Related Party Transactions (Details) |  | 1 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
May 09, 2018 shares | May 31, 2018 a shares | Aug. 31, 2016 a | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Related Party Transactions [Abstract] |  |  |  |  |  |
Company contribution to a multi employer 401K plan at discretionary amount of employee's cash compensation, maximum percentage |  |  |  | 6.00% |  |
Company contribution to a multi employer 401K plan at discretionary amount of employee's cash compensation, amount |  |  |  | $ 176,100 | $ 185,500 |
Deferred compensation, employee contribution, percentage |  |  |  | 2.00% |  |
Deferred compensation, company contribution, amount |  |  |  | $ 98,600 | $ 94,400 |
Deferred compensation, company contribution, percentage |  |  |  | 3 | 3 |
Deferred compensation, cumulative unfunded liability |  |  |  | $ 2,500,000 |  | $ 2,400,000
Ancillary costs and expenses |  |  |  | 4,100,000 | $ 3,700,000 |
Liability due to The Saul Organization for the Company's share of these ancillary costs and expenses |  |  |  | $ 788,200 |  | $ 993,200
Related Party Transaction [Line Items] |  |  |  |  |  |
Percentage of annual increase in base rent |  |  |  | 3.00% |  |
Rent expense |  |  |  | $ 395,400 | 379,300 |
Insurance commissions and fees expense |  |  |  | $ 150,500 | $ 85,700 |
Ashbrook Marketplace |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Area of real estate acquired (in acres) | a |  | 13.7 |  |  |  |
Ashbrook Marketplace | BF Saul Real Estate Investment Trust |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Area of real estate acquired (in acres) | a |  |  | 13.7 |  |  |
Limited partnership units issued for purchase (in shares) | shares | 176,680 | 176,680 |  |  |  |

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