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Schedule IV - Mortgage Loans on Real Estate - Mortgage Loans on Real Estate (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Carrying amount		$ 32,246	$ 7,829	$ 14,448	$ 21,838
Mortgage Loans [Member]
Face amount		34,954
Carrying amount	[1]	32,246
Allowance for Credit losses:	[1]	$ (930)
Retail Site [Member] | Las Vegas, NV [Member] | Borrower A [Member] | Mortgage Loans [Member]
Interest rate		12.00%
Face amount		$ 3,075
Carrying amount	[1]	$ 3,075
Retail Site [Member] | Walker, MI [Member] | Borrower B [Member] | Mortgage Loans [Member]
Interest rate		4.00%
Face amount		$ 3,750
Carrying amount	[1]	$ 3,671
Retail Site [Member] | Pompano, FL [Member] | Borrower C [Member] | Mortgage Loans [Member]
Interest rate		12.00%
Face amount		$ 25,000
Carrying amount	[1]	$ 25,000
Retail Site [Member] | Mesa, AZ [Member] | Borrower D [Member] | Mortgage Loans [Member]
Interest rate		12.00%
Face amount		$ 500
Carrying amount	[1]	$ 500
Nonretail [Member] | Borrower A [Member] | Other Financing Loans [Member]
Interest rate		2.28%
Face amount		$ 600
Carrying amount	[1]	$ 305
Nonretail [Member] | Borrower B [Member] | Other Financing Loans [Member]
Interest rate		5.00%
Face amount		$ 175
Carrying amount	[1]	$ 125
Nonretail [Member] | Commack, NY [Member] | Borrower E [Member] | Mortgage Loans [Member]
Interest rate		7.41%
Face amount		$ 1,354
Carrying amount	[1]	$ 256
Nonretail [Member] | Melbourne, FL [Member] | Borrower F [Member] | Mortgage Loans [Member]
Interest rate		6.88%
Face amount		$ 500
Carrying amount	[1]	$ 244
[1] The aggregate cost for Federal income tax purposes was approximately $32.2 million as of December 31, 2020.

X

- Definition

Amount of contractual principal due at origination of mortgage loan within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Paragraph Column F
-Subsection 29

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Column F))
-URI http://asc.fasb.org/extlink&oid=120402547&loc=d3e617274-123014

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X

- Definition

Interest rate of mortgage loan within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Paragraph Column B
-Subsection 29

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Column B))
-URI http://asc.fasb.org/extlink&oid=120402547&loc=d3e617274-123014

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X

- Definition

Amount of investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Column G))
-URI http://asc.fasb.org/extlink&oid=120402547&loc=d3e617274-123014

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X

- Definition

Amount of mortgage loan within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate, written down.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Footnote 7))
-URI http://asc.fasb.org/extlink&oid=120402547&loc=d3e617274-123014

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