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Sale of Properties and Property Held-for-Sale (Details) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 20, 2019 | Jan. 30, 2018 | Jul. 31, 2019 | Dec. 31, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2019 | Sep. 14, 2018 | Nov. 30, 2017
Sale of Property |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  | $ 23,585,000 | $ 17,659,000 |  |  |
Gain on sale of real estate, net |  |  |  |  | 3,643,000 | 6,993,000 |  |  |
Property held-for-sale |  |  |  |  | 1,227,000 |  |  |  |
Retail Property Clemmons, North Carolina |  |  |  |  |  |  |  |  |
Sale of Property |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  | 5,500,000 |  |  |  |
Gain on sale of real estate, net |  |  |  |  | 1,099,000 |  |  |  |
Prepayment costs on debt related to a swap termination fee |  |  |  |  | 40,000 |  |  |  |
Retail property, Athens, Georgia |  |  |  |  |  |  |  |  |
Sale of Property |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  | 6,050,000 |  |  |  |
Gain on sale of real estate, net |  |  |  |  | 1,045,000 |  |  |  |
Prepayment costs on debt related to a swap termination fee |  |  |  |  | 161,000 |  |  |  |
Land, Wheaton, Illinois |  |  |  |  |  |  |  |  |
Sale of Property |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  | 12,035,000 |  |  |  |
Gain on sale of real estate, net |  |  |  |  | 1,499,000 |  |  |  |
Retail Property, Fort Bend, Texas |  |  |  |  |  |  |  |  |
Sale of Property |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  | 9,200,000 |  |  |
Gain on sale of real estate, net |  |  |  |  |  | 2,408,000 |  |  |
Land, Lakemoor, Illinois |  |  |  |  |  |  |  |  |
Sale of Property |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  | 8,459,000 |  |  |
Gain on sale of real estate, net |  |  |  |  |  | $ 4,585,000 |  |  |
Unamortized balance, fixed rent |  |  |  |  |  |  |  | $ 5,717,000 |
Deferred income |  |  |  |  |  |  |  |  | $ 5,906,000
Retail Property, Houston, Texas |  |  |  |  |  |  |  |  |
Sale of Property |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  | $ 1,675,000 |  |  |  |  |  |
Property held-for-sale |  |  |  |  | $ 1,227,000 |  |  |  |
Retail Property, Houston, Texas | Forecast |  |  |  |  |  |  |  |  |
Sale of Property |  |  |  |  |  |  |  |  |
Gain on sale of real estate, net |  |  |  | $ 218,000 |  |  | $ 218,000 |  |
Consolidated Joint Venture | Retail Property Clemmons, North Carolina |  |  |  |  |  |  |  |  |
Sale of Property |  |  |  |  |  |  |  |  |
Ownership interest in consolidated joint venture of the company (as a percent) | 90.00% |  |  |  |  |  |  |  |
Non-controlling interest's share of the gain | $ 422,000 |  |  |  |  |  |  |  |
Consolidated Joint Venture | Retail Property, Fort Bend, Texas |  |  |  |  |  |  |  |  |
Sale of Property |  |  |  |  |  |  |  |  |
Ownership interest in consolidated joint venture of the company (as a percent) |  | 85.00% |  |  |  |  |  |  |
Non-controlling interest's share of the gain |  | $ 776,000 |  |  |  |  |  |  |

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