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Schedule IV - Mortgage Loans on Real Estate Schedule IV - Mortgage Loans on Real Estate (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Carrying amount	$ 162,433,000	$ 164,576,000	$ 230,927,000	$ 259,491,000
Amount of delinquent loans	0
Federal income tax basis	175,200,000
Origination fee, and premium (discount)	$ 32,500
Second Mortgages | Winter Park, FL
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest	12.00%
Maturity	Oct. 31, 2025
Payment	Interest Only
Face Amount	$ 1,550,000
Carrying amount	$ 1,550,000
Construction Loans | Canton, MI
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest	9.00%
Maturity	Dec. 31, 2023
Payment	Interest Only
Face Amount	$ 14,700,000
Carrying amount	$ 14,700,000
Construction Loans | Fitchburg, WI
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest	8.50%
Maturity	Jan. 28, 2026
Payment	Interest Only
Face Amount	$ 28,525,000
Carrying amount	$ 27,662,000
Construction Loans | Sussex, WI
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest	8.50%
Maturity	Dec. 31, 2024
Payment	Interest Only
Face Amount	$ 22,200,000
Carrying amount	$ 22,337,000
Skilled Nursing Facilities | First Mortgages | Lexington, VA
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest	8.00%
Maturity	Dec. 31, 2032
Mortgage and other notes receivable, periodic payments	$ 21,000
Face Amount	3,089,000
Carrying amount	$ 1,326,000
Skilled Nursing Facilities | First Mortgages | Brookneal, VA
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest	8.00%
Maturity	Dec. 31, 2031
Mortgage and other notes receivable, periodic payments	$ 21,000
Face Amount	2,780,000
Carrying amount	$ 1,261,000
Skilled Nursing Facilities | First Mortgages | Austin/San Antonio, TX
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest	7.25%
Maturity	Nov. 30, 2027
Payment	Interest Only
Face Amount	$ 42,500,000
Carrying amount	$ 42,380,000
Assisted Living Facilities | First Mortgages | Oviedo, FL
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest	8.25%
Maturity	Jul. 31, 2025
Payment	Interest Only
Face Amount	$ 10,000,000
Carrying amount	$ 10,000,000
Assisted Living Facilities | First Mortgages | Indianapolis, IN
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest	7.00%
Maturity	Dec. 31, 2022
Payment	Interest Only
Face Amount	$ 6,423,000
Carrying amount	$ 6,423,000
Assisted Living Facilities | First Mortgages | Wabash, IN
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest	7.00%
Maturity	Dec. 31, 2025
Payment	Interest Only
Face Amount	$ 4,000,000
Carrying amount	$ 2,094,000
Entrance-Fee Communities | First Mortgages | Columbia, SC
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest	7.25%
Maturity	Dec. 31, 2024
Payment	Interest Only
Face Amount	$ 32,700,000
Carrying amount	$ 32,700,000

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+ References

No definition available.

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Maturity date 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, in YYYY-MM-DD format.

+ References

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Amount of federal income tax basis 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.

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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.

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