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COMMITMENTS AND CONTINGENCIES (FY) (Details) - USD ($) |  | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 29, 2020 | Jun. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Sep. 29, 2020
COMMITMENTS AND CONTINGENCIES [Line Items] |  |  |  |  |
Restricted cash |  | $ 2,508,471 | $ 129,118 | $ 113,362 |
Operating lease, remaining lease term |  |  | 4 years 6 months |  |
Lease termination fee | $ (1,350,000) |  | $ (1,039,648) | 0 |
Collection (release) of security deposit | (135,544) |  |  |  |
Cash payment of operating lease | $ 1,214,456 |  |  |  |
Operating lease liability |  |  | 0 | 2,386,877 | $ 2,087,713
Operating lease, current liability |  |  |  |  | 242,216
Operating lease right-of-use asset |  |  | $ 0 | 2,386,877 | $ 2,019,577
Operating lease, discount rate |  |  | 5.75% |  |
Share repurchases payable |  | $ 1,001,243 | $ 2,980,559 | 0 |
Maximum |  |  |  |  |
COMMITMENTS AND CONTINGENCIES [Line Items] |  |  |  |  |
Shares authorized to be repurchased per month (as a percent) |  | 2.00% | 2.00% |  |
Shares authorized to be repurchased per quarter (as a percent) |  | 5.00% | 5.00% |  |
Lease Agreements |  |  |  |  |
COMMITMENTS AND CONTINGENCIES [Line Items] |  |  |  |  |
Obligation amount to pay for site and tenant improvements |  |  | $ 60,598 | 98,329 |
Restricted cash |  | $ 2,400,000 | $ 92,684 | $ 92,684 |
Lease Agreements | Santa Clara Property |  |  |  |  |
COMMITMENTS AND CONTINGENCIES [Line Items] |  |  |  |  |
Ownership (as a percent) |  |  | 72.70% |  |

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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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- Definition Gain (loss) related to the termination of a contract between the parties. The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one party, or a failure to perform. + 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 -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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- Definition The increase (decrease) during the reporting period in moneys or securities given as security including, but not limited to, contract, escrow, or earnest money deposits, retainage (if applicable), deposits with clearing organizations and others, collateral, or margin deposits. + 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 (a) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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- Definition Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
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- Definition Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(2)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=123431023&loc=SL98516268-108586 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(1)(a)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3044-108585 + Details
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