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Debt - Narratives - Purchase agreement, Revolving credit facility (Details) - USD ($)				1 Months Ended	9 Months Ended
	Oct. 02, 2020	Sep. 03, 2020	Dec. 12, 2018	Jun. 20, 2019	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Repurchase Agreements
Repayment of borrowings under repurchase agreement						$ 103,994,570
Proceeds from (Payments for) in Securities Sold under Agreements to Repurchase					$ 0	22,860,134
Revolving Credit Facility
Proceeds from borrowings under revolving line of credit					$ 25,299,713	$ 35,000,000
Revolving Credit Facility
Revolving Credit Facility
Maximum Borrowing Capacity				$ 35,000,000
Line of Credit Facility, Remaining Borrowing Capacity	$ 15,000,000
Line of Credit Facility, Fair Value of Amount Outstanding							$ 0
Line of Credit Facility, Expiration Date	Sep. 02, 2021
Revolving Credit Facility | Floor rate
Revolving Credit Facility
Debt Instrument, Basis Spread on Variable Rate	4.50%			6.00%
Revolving Credit Facility | LIBOR
Revolving Credit Facility
Debt Instrument, Basis Spread on Variable Rate	4.00%			4.00%
Revolving Credit Facility | Prime Rate
Revolving Credit Facility
Debt Instrument, Basis Spread on Variable Rate	1.00%			1.00%
Master Repurchase Agreement
Repurchase Agreements
Repayment of borrowings under repurchase agreement		$ 3,400,000
Maximum liability under repurchase agreement percent		50.00%
Master Repurchase Agreement | Terra Mortgage Capital LLC
Revolving Credit Facility
Maximum Borrowing Capacity			$ 150,000,000
Maturity Date			Dec. 12, 2020

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Date when the debt instrument is scheduled to be fully repaid, in YYYY-MM-DD format.

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The increase (decrease) during the reporting period in the liability under agreements to repurchase securities that were sold.

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Fair value of the amount outstanding under the credit facility.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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