REVENUE RECOGNITION - Timing of Revenue Recognition (Details) - USD ($)	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Revenues
Over Lease Term	$ 9,389,000	$ 7,275,000
Commercial Loan Investment Related Revenue	301,000	537,000
Total Revenues	24,851,599	38,713,284
Asset/Good Transferred at a Point in Time
Revenues
Revenue from contract with customer, including assessed tax	14,875,000
Services Transferred Over Time
Revenues
Revenue from contract with customer, including assessed tax	287,000
Income Properties
Revenues
Over Lease Term	9,179,000	7,065,000
Total Revenues	9,205,727	7,073,240
Income Properties \| Services Transferred Over Time
Revenues
Revenue from contract with customer, including assessed tax	27,000
Commercial Loan Investments
Revenues
Commercial Loan Investment Related Revenue	301,000	537,000
Total Revenues	300,999	536,489
Real Estate Operations
Revenues
Over Lease Term	199,000	199,000
Total Revenues	13,979,330	29,474,460
Real Estate Operations \| Asset/Good Transferred at a Point in Time
Revenues
Revenue from contract with customer, including assessed tax	13,780,000
Golf Operations
Revenues
Total Revenues	1,354,356	1,474,944
Golf Operations \| Asset/Good Transferred at a Point in Time
Revenues
Revenue from contract with customer, including assessed tax	1,095,000
Golf Operations \| Services Transferred Over Time
Revenues
Revenue from contract with customer, including assessed tax	260,000
Agriculture and Other Income
Revenues
Over Lease Term	11,000	11,000
Total Revenues	$ 11,187	154,151
Calculated under Revenue Guidance in Effect before Topic 606 \| Asset/Good Transferred at a Point in Time
Revenues
Revenue from contract with customer, including assessed tax		30,330,000
Calculated under Revenue Guidance in Effect before Topic 606 \| Services Transferred Over Time
Revenues
Revenue from contract with customer, including assessed tax		571,000
Calculated under Revenue Guidance in Effect before Topic 606 \| Income Properties \| Services Transferred Over Time
Revenues
Revenue from contract with customer, including assessed tax		8,000
Calculated under Revenue Guidance in Effect before Topic 606 \| Real Estate Operations \| Asset/Good Transferred at a Point in Time
Revenues
Revenue from contract with customer, including assessed tax		28,955,000
Calculated under Revenue Guidance in Effect before Topic 606 \| Real Estate Operations \| Services Transferred Over Time
Revenues
Revenue from contract with customer, including assessed tax		320,000
Calculated under Revenue Guidance in Effect before Topic 606 \| Golf Operations \| Asset/Good Transferred at a Point in Time
Revenues
Revenue from contract with customer, including assessed tax		1,232,000
Calculated under Revenue Guidance in Effect before Topic 606 \| Golf Operations \| Services Transferred Over Time
Revenues
Revenue from contract with customer, including assessed tax		243,000
Calculated under Revenue Guidance in Effect before Topic 606 \| Agriculture and Other Income \| Asset/Good Transferred at a Point in Time
Revenues
Revenue from contract with customer, including assessed tax		$ 143,000

Interest and fee income related to commercial loans including industrial and agricultural, real estate (commercial and residential, construction and development), trade financing, and lease financing.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.1)
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 25
-Paragraph 1
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 32
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-URI http://asc.fasb.org/extlink&oid=82859839&loc=SL82860478-203043

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130539-203045

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130543-203045

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
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