BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Leases (Details) - USD ($)	3 Months Ended
Mar. 31, 2021	Dec. 31, 2020
Lessor, Lease, Description [Line Items]
Rent deferrals and abatements outstanding	$ 57,000	$ 99,600
Reduction in revenue	47,000
Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract]
2021 (remainder)	1,650,000
2022	2,209,000
2023	2,205,000
2024	2,194,000
2025	2,159,000
Thereafter	2,302,000
Total scheduled lease income - commercial operating leases	$ 12,719,000
Minimum
Lessor, Lease, Description [Line Items]
Concentration risk	0.50%
Lease terms	3 years
Maximum
Lessor, Lease, Description [Line Items]
Concentration risk	1.00%
Lease terms	15 years
Rental Income \| Revenue \| Product Concentration Risk
Lessor, Lease, Description [Line Items]
Concentration risk	98.20%
Fee Income \| Revenue \| Product Concentration Risk
Lessor, Lease, Description [Line Items]
Concentration risk	1.80%

Lessor, Operating Lease, Payment to be Received, after Year Four

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Rent Deferrals, Outstanding

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Revenue Reduction Due To Rental Abatements, Amount

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Amount of lease payments to be received by lessor for operating lease.

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Amount of lease payment to be received by lessor for operating lease in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of lease payment to be received by lessor for operating lease in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of lease payment to be received by lessor for operating lease in remainder of current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of lease payment to be received by lessor for operating lease in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of lease payment to be received by lessor for operating lease in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Term of lessor's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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