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REAL ESTATE INVESTMENTS - Real Estate Impairment Charges (FY) (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2020 | Jun. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Real Estate [Line Items] |  |  |  |  |  |  |  |  |
Impairment of real estate investment properties |  | $ (400,999) | $ 761,100 | $ 349,457 | $ 9,157,068 | $ (400,999) | $ 9,506,525 | $ 10,267,625 | $ 0
Dana | Industrial |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |
Impairment of real estate investment properties |  |  |  | 0 |  |  | 2,184,395 | 2,184,395 |
24 Hour Fitness | Retail |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |
Impairment of real estate investment properties |  |  |  | 0 | $ 5,664,517 |  | 5,664,517 | 5,664,517 |
Dinan Cars | Industrial |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |
Impairment of real estate investment properties |  |  |  | 0 |  |  | 1,308,156 | 1,308,156 |
Rite Aid | Industrial |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |
Impairment of real estate investment properties |  |  |  | 349,457 |  |  | $ 349,457 |  |
Rite Aid | Retail |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |
Impairment of real estate investment properties |  |  |  | $ 349,457 |  |  |  | 349,457 |
Harley Davidson | Retail |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |
Impairment of real estate investment properties | $ 632,233 | $ 400,999 |  |  |  |  |  | 632,233 |
Chevron Gas Station, San Jose | Retail |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |
Impairment of real estate investment properties |  |  |  |  |  |  |  | $ 128,867 |

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- Definition The charge against earnings in the period to reduce the carrying amount of real property to fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230 + Details
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