Debt - Details of each borrowing under the Master Repurchase Agreement (Details) - USD ($)	3 Months Ended	12 Months Ended
Mar. 31, 2020	Dec. 31, 2019
Debt Instrument
Debt Instrument, Face Amount	$ 176,784,964	$ 201,624,466
Line of Credit Facility, Expiration Date	Jun. 20, 2020
Collateral
Debt Instrument
Debt Instrument, Face Amount	$ 136,146,930
Debt Instrument, Collateral Amount	136,529,840
Debt Instrument, Fair Value Disclosure	135,750,312
Master Repurchase Agreement
Debt Instrument
Debt Instrument, Face Amount	$ 92,546,530
Debt Instrument Weighted Average Term	1 year 6 months	1 year 7 months
330 Tryon DE LLC \| Collateral
Debt Instrument
Debt Instrument, Face Amount	$ 22,800,000	$ 22,800,000
Debt Instrument, Collateral Amount	22,893,646	22,891,149
Debt Instrument, Fair Value Disclosure	$ 22,862,074	22,906,207
330 Tryon DE LLC \| Master Repurchase Agreement
Debt Instrument
Debt Instrument, Description of Variable Rate Basis	LIBOR
Debt Instrument, Face Amount	$ 17,100,000	17,100,000
Debt Instrument, Issuance Date	Feb. 15, 2019
330 Tryon DE LLC \| Master Repurchase Agreement \| LIBOR
Debt Instrument
Debt Instrument, Basis Spread on Variable Rate	2.25%
1389 Peachtree St, L.P. and Others \| Collateral
Debt Instrument
Debt Instrument, Face Amount	$ 41,523,796	38,464,429
Debt Instrument, Collateral Amount	41,631,238	38,510,650
Debt Instrument, Fair Value Disclosure	$ 41,676,800	38,655,000
1389 Peachtree St, L.P. and Others \| Master Repurchase Agreement
Debt Instrument
Debt Instrument, Description of Variable Rate Basis	LIBOR
Debt Instrument, Face Amount	$ 24,448,102	24,040,268
Debt Instrument, Issuance Date	Mar. 07, 2019
1389 Peachtree St, L.P. and Others \| Master Repurchase Agreement \| LIBOR
Debt Instrument
Debt Instrument, Basis Spread on Variable Rate	2.35%
AGRE DCP Palm Springs LLC \| Collateral
Debt Instrument
Debt Instrument, Face Amount	$ 30,514,799	30,184,357
Debt Instrument, Collateral Amount	30,522,379	30,174,455
Debt Instrument, Fair Value Disclosure	$ 30,551,440	30,326,076
AGRE DCP Palm Springs LLC \| Master Repurchase Agreement
Debt Instrument
Debt Instrument, Description of Variable Rate Basis	LIBOR
Debt Instrument, Face Amount	$ 19,242,528	22,638,268
Debt Instrument, Issuance Date	Dec. 23, 2019
AGRE DCP Palm Springs LLC \| Master Repurchase Agreement \| LIBOR
Debt Instrument
Debt Instrument, Basis Spread on Variable Rate	2.50%
MSC Fields Peachtree Retreat LLC \| Collateral
Debt Instrument
Debt Instrument, Face Amount	$ 23,308,335	23,308,335
Debt Instrument, Collateral Amount	23,444,431	23,446,793
Debt Instrument, Fair Value Disclosure	$ 22,886,081	23,418,996
MSC Fields Peachtree Retreat LLC \| Master Repurchase Agreement
Debt Instrument
Debt Instrument, Description of Variable Rate Basis	LIBOR
Debt Instrument, Face Amount	$ 17,355,900	17,355,900
Debt Instrument, Issuance Date	Mar. 25, 2019
MSC Fields Peachtree Retreat LLC \| Master Repurchase Agreement \| LIBOR
Debt Instrument
Debt Instrument, Basis Spread on Variable Rate	2.25%
Patrick Henry Recovery Acquisition LLC \| Collateral
Debt Instrument
Debt Instrument, Face Amount	$ 18,000,000	114,757,121
Debt Instrument, Collateral Amount	18,038,146	115,023,047
Debt Instrument, Fair Value Disclosure	$ 17,773,917	115,306,279
Patrick Henry Recovery Acquisition LLC \| Master Repurchase Agreement
Debt Instrument
Debt Instrument, Description of Variable Rate Basis	LIBOR
Debt Instrument, Face Amount	$ 14,400,000	$ 81,134,436
Debt Instrument, Issuance Date	Jan. 06, 2020
Patrick Henry Recovery Acquisition LLC \| Master Repurchase Agreement \| LIBOR
Debt Instrument
Debt Instrument, Basis Spread on Variable Rate	2.00%
Floor rate \| 330 Tryon DE LLC \| Master Repurchase Agreement \| LIBOR
Debt Instrument
Debt Instrument, Basis Spread on Variable Rate	2.52%
Floor rate \| AGRE DCP Palm Springs LLC \| Master Repurchase Agreement \| LIBOR
Debt Instrument
Debt Instrument, Basis Spread on Variable Rate	1.80%
Floor rate \| MSC Fields Peachtree Retreat LLC \| Master Repurchase Agreement \| LIBOR
Debt Instrument
Debt Instrument, Basis Spread on Variable Rate	2.00%
Floor rate \| Patrick Henry Recovery Acquisition LLC \| Master Repurchase Agreement \| LIBOR
Debt Instrument
Debt Instrument, Basis Spread on Variable Rate	1.50%
Centennial Bank
Debt Instrument
Debt Instrument, Description of Variable Rate Basis	LIBOR
Centennial Bank \| LIBOR
Debt Instrument
Debt Instrument, Basis Spread on Variable Rate	3.85%
Centennial Bank \| Floor rate \| LIBOR
Debt Instrument
Debt Instrument, Basis Spread on Variable Rate	2.23%

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

No definition available.

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- Definition

Amount of assets pledged to secure a debt instrument.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

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- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

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- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611

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- Definition

Date the debt instrument was issued, in CCYY-MM-DD format.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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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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- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Definition

Weighted average maturity (weighted by amount of the agreement) of resale agreements with the counterparty, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

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