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INTEREST RATE SWAP DERIVATIVES - Notional Amounts of Derivative Instruments (FY) (Details)	12 Months Ended
	Dec. 31, 2020 USD ($) instrument	Dec. 31, 2019 USD ($) instrument	Jun. 30, 2021 USD ($) instrument
Minimum
Derivatives, Fair Value [Line Items]
Minimum notional amounts	$ 34,989,063		$ 24,935,999
Interest Rate Swap
Derivatives, Fair Value [Line Items]
Number of Instruments | instrument	8	12	4
Notional Amount	$ 36,617,164	$ 48,215,139
Weighted Average Fixed Pay Rate	3.35%	3.87%	4.55%
Weighted Average Remaining Term	2 years 2 months 12 days	2 years 10 months 24 days
Minimum notional amounts	$ 36,617,164		$ 26,291,600
Interest Rate Swap | Minimum
Derivatives, Fair Value [Line Items]
Minimum notional amounts	$ 34,989,063	$ 45,514,229
(LIBOR) | Interest Rate Swap | Minimum
Derivatives, Fair Value [Line Items]
Reference Rate	3.13%	2.76%	4.05%
(LIBOR) | Interest Rate Swap | Maximum
Derivatives, Fair Value [Line Items]
Reference Rate	5.16%	5.16%	5.16%

X

- Definition

Average fixed interest rate related to the group of interest rate derivatives.

+ References

No definition available.

+ Details

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- Definition

Average remaining period until maturity of the derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

Fixed interest rate related to the interest rate derivative.

+ References

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- Definition

Nominal or face amount used to calculate payments on the derivative liability.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959

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- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959

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- Definition

The number of derivative instruments of a particular group held by the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
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-Section 50
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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