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Fair Value Measurements - Recurring Measurements (Details) - Fair Value, Measurements, Recurring - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Level 1
Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis
Available-for-sale marketable securities		$ 4,431,000
Real estate related bonds		0
Derivative interest rate swaps	$ 0	0
Total assets	0	4,431,000
Level 2
Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis
Available-for-sale marketable securities		0
Real estate related bonds		327,000
Derivative interest rate swaps	1,637,000	1,670,000
Total assets	1,637,000	1,997,000
Level 3
Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis
Available-for-sale marketable securities		0
Real estate related bonds		0
Derivative interest rate swaps	0	0
Total assets	$ 0	$ 0

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562

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