BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Leases (Details)	12 Months Ended
Dec. 31, 2020 USD ($)
Lessor, Lease, Description [Line Items]
Rent deferral agreement, amounts outstanding	$ 99,600
Reduction in revenue, due to abated rent	656,000
Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract]
2021	2,216,000
2022	2,214,000
2023	2,208,000
2024	2,194,000
2025	2,166,000
Thereafter	2,373,000
Lessor, Operating Lease, Payments to be Received, Total	$ 13,371,000
Minimum
Lessor, Lease, Description [Line Items]
Concentration risk	0.005%
Term of lease contract	3 years
Maximum
Lessor, Lease, Description [Line Items]
Concentration risk	0.01%
Term of lease contract	15 years
Rental Income \| Product Concentration Risk \| Revenue Benchmark
Lessor, Lease, Description [Line Items]
Concentration risk	98.40%
Fee Income \| Product Concentration Risk \| Revenue Benchmark
Lessor, Lease, Description [Line Items]
Concentration risk	1.60%

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

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Reduction in Revenue, Due to Abated Rent

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Rent Deferral Agreement, Amounts Outstanding

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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 fifth 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 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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