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INTEREST RATE SWAP DERIVATIVES - Narrative (Q2) (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2021 USD ($) instrument	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) instrument	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($) instrument	Dec. 31, 2019 USD ($) instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of swap agreements terminated					3
(Gain) loss on interest rate swaps | $	$ 90,600	$ (7,785)	$ 517,719	$ (1,292,752)	$ (770,898)	$ (820,496)
Interest Rate Swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of mortgage notes payable	4		4			4
Number of swap agreements terminated			4

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Derivative, Number of Instruments Terminated

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Number of Mortgage Notes Payable

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

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