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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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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.

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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.

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