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Sales of Properties and Property Held-for-Sale (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Jul. 01, 2020 | Jun. 30, 2020 | Feb. 29, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Sale of Property |  |  |  |  |  |  |  |
Repayment of mortgages payable |  |  |  |  |  |  | $ 3,332,000 | $ 1,705,000
Prepayment costs on debt |  |  |  |  | $ (775,000) | $ (41,000) | (1,065,000) | $ (41,000)
Property held-for-sale, net book value |  | $ 7,661,000 |  |  | 7,661,000 |  | 7,661,000 |
Retail property, Onalaska, Wisconsin |  |  |  |  |  |  |  |
Sale of Property |  |  |  |  |  |  |  |
Proceeds from sale of real estate, net of closing costs |  |  | $ 7,093,000 |  |  |  |  |
Gain on sale of property |  |  |  |  |  |  | 4,252,000 |
Repayment of mortgages payable |  |  |  |  |  |  | 3,332,000 |
Prepayment costs on debt |  |  |  |  |  |  | 290,000 |
Property located in Clemmons, North Carolina |  |  |  |  |  |  |  |
Sale of Property |  |  |  |  |  |  |  |
Ownership interest in consolidated joint venture of the company (as a percent) |  |  |  | 90.00% |  | 90.00% |  | 90.00%
Retail Property, Knoxville, TN |  |  |  |  |  |  |  |
Sale of Property |  |  |  |  |  |  |  |
Gain on sale of property | $ 10,316,000 |  |  |  |  |  |  |
Repayment of mortgages payable | $ 8,483,000 |  |  |  |  |  |  |
Gross Sales Price |  | 18,000,000 |  |  |  |  |  |
Property held-for-sale, net book value |  | $ 7,661,000 |  |  | $ 7,661,000 |  | $ 7,661,000 |
Consolidated Joint Venture | Property located in Clemmons, North Carolina |  |  |  |  |  |  |  |
Sale of Property |  |  |  |  |  |  |  |
Proceeds from sale of real estate, net of closing costs |  |  |  | $ 5,314,000 |  |  |  |
Gain on sale of property |  |  |  |  |  | $ 1,099,000 |  | $ 1,099,000
Repayment of mortgages payable |  |  |  | 1,705,000 |  |  |  |
Non-controlling interest's share of the gain |  |  |  | $ 422,000 |  |  |  |

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- Definition The parent entity's controlling interest held in a consolidated entity, expressed as a percentage. + References No definition available. + Details
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- Definition Gross proceeds received from the sale of real estate during the current period. + References No definition available. + Details
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- Definition The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2443-110228 + Details
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