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Related Party Transactions - Compensation and Services Agreement (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
RELATED PARTY TRANSACTIONS
Total charge to operations	$ 976,000	$ 954,000
Majestic
RELATED PARTY TRANSACTIONS
Fees under compensation and services agreement	767,000	704,000
Property management costs allocated to real estate expenses	331,000	324,000
Additional payment for the entity's share of all direct office expenses	69,000	54,000
Executive officers and others
RELATED PARTY TRANSACTIONS
Total charge to operations	449,000	470,000
Chairman | General and administrative expense
RELATED PARTY TRANSACTIONS
Fees under compensation and services agreement	74,500	72,400
Vice Chairman
RELATED PARTY TRANSACTIONS
Fees under compensation and services agreement	$ 29,800	$ 28,900
Net lease tenants | Majestic
RELATED PARTY TRANSACTIONS
Property management costs (as a percent)	1.50%
Operating lease tenants | Majestic
RELATED PARTY TRANSACTIONS
Property management costs (as a percent)	2.00%

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- Definition

Represents the amount of additional payment to related party for the share of direct office expenses.

+ References

No definition available.

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- Definition

Represents the amount to be paid under the agreement with the related party.

+ References

No definition available.

+ Details

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- Definition

Represents the amount of property management costs allocated to real estate expenses.

+ References

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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- Definition

The percentage charged for managing real estate properties.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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