Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(2))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(1))
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(1)(a))
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Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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Name:	us-gaap_RestrictedCashAndCashEquivalents
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

DESCRIPTION OF BUSINESS AND PRINCIPLES OF INTERIM STATEMENTS - Restricted Cash and Investment Securities (Details)	Sep. 30, 2018 USD ($) Transaction item property	Feb. 28, 2018 USD ($)	Feb. 21, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)
Restricted Cash
Restricted Cash	$ 8,477,796		$ 620,000	$ 6,508,131	$ 7,027,196
Restricted cash, escrow deposit related to land transactions
Restricted Cash
Restricted Cash	$ 1,200,000
Number of separate escrow accounts \| item	3
Number of separate land transactions \| Transaction	3
Restricted cash, escrow deposit related to other income properties
Restricted Cash
Restricted Cash	$ 6,500,000
Number of separate escrow accounts \| item	2
Capital replacement reserve account
Restricted Cash
Restricted Cash	$ 197,000
Number of real estate properties in financing \| property	6
Leasing reserve account
Restricted Cash
Restricted Cash		$ 620,000