CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($)		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022
Preferred stock par value per share (in dollars per share)		$ 0.01	$ 0.01
Preferred stock shares authorized (in shares)		25,000,000	25,000,000
Common stock shares outstanding (in shares)		27,460,161	23,130,956
Mortgage loans held-for-investment, net	[1],[2]	$ 864,551,000	$ 989,084,000
Allowance for credit loss		3,426,000	6,107,000
Loan, Mortgage, Held-for-Sale, Fair Value Disclosure		55,718,000	0
Real estate owned, net of valuation allowance		1,200,000	700,000
Debt securities, held-to-maturity, allowance for credit loss		0
Debt securities, held-to-maturity, accumulated unrecognized loss		(629,000)
Non-controlling interests	[3]	1,962,000	2,137,000
Investment in debt securities
Debt securities available-for-sale, at fair value		139,600,000	282,700,000
Debt securities accumulated unrealized gain (loss)		$ (8,000,000)	$ (25,600,000)
Common Stock
Common stock par value per share (in dollars per share)		$ 0.01	$ 0.01
Common stock shares authorized (in shares)		125,000,000	125,000,000
Common stock shares issued (in shares)		27,460,161
Common stock shares outstanding (in shares)		27,460,161	23,130,956
Investment in beneficial interests
Allowance for credit loss		$ 6,900,000	$ 0
Accumulated Net Investment Gain (Loss) Attributable to Parent
Debt securities, held-to-maturity, accumulated unrecognized loss		$ (5,989,000)	$ 0
Series A Preferred Stock
Preferred stock dividend rate percentage		7.25%	7.25%
Preferred stock, liquidation preference (in dollars per share)		$ 25.00	$ 25.00
Preferred stock outstanding (in shares)		424,949	424,949
Series A Preferred Stock | Preferred Stock
Preferred stock issued (in shares)		424,949	424,949
Preferred stock outstanding (in shares)		424,949	424,949
Series B Preferred Stock
Preferred stock dividend rate percentage		5.00%	5.00%
Preferred stock, liquidation preference (in dollars per share)			$ 25.00
Preferred stock outstanding (in shares)		1,135,590	1,135,590
Series B Preferred Stock | Preferred Stock
Preferred stock issued (in shares)		1,135,590	1,135,590
Preferred stock outstanding (in shares)		1,135,590	1,135,590
2017-D
Percentage of ownership interests in joint venture (in percent)		50.00%	50.00%
Investment in Ajax E Master Trust
Ownership percentage by parent (in percent)		53.10%	53.10%
GAOP - 7f7 >50
Ownership percentage by parent (in percent)		99.90%	99.90%
Consolidated Entities
Loan, Mortgage, Held-for-Sale, Fair Value Disclosure		$ 600,000	$ 900,000
Consolidated Entities | 2017-D
Non-controlling interests		800,000	1,000,000
Consolidated Entities | Investment in Ajax E Master Trust
Non-controlling interests		1,000,000	1,100,000
Consolidated Entities | GAOP - 7f7 >50
Non-controlling interests		$ 100,000	$ 100,000
2017-D | Great Ajax Corp
Ownership percentage by parent (in percent)		50.00%	50.00%
Mortgage loans
Mortgage loans held-for-investment, net		$ 628,615,000	$ 675,826,000
Secured Debt
Debt issuance costs, net		3,100,000	4,700,000
Convertible Debt
Debt issuance costs, net		0	300,000
Notes Payable, Other Payables
Debt issuance costs, net		$ 3,200,000	$ 4,000,000

[1] As of December 31, 2023 and 2022, balances for Mortgage loans held-for-investment, net include $0.6 million and $0.9 million, respectively, from a 50.0% owned joint venture, which the Company consolidates under U.S. Generally Accepted Accounting Principles ("U.S. GAAP" or "GAAP").

[2] Mortgage loans held-for-investment, net include $628.6 million and $675.8 million of loans at December 31, 2023 and 2022, respectively, transferred to securitization trusts that are variable interest entities (“VIEs”); these loans can only be used to settle obligations of the VIEs. Secured borrowings consist of notes issued by VIEs that can only be settled with the assets and cash flows of the VIEs. The creditors do not have recourse to the primary beneficiary (Great Ajax Corp.). See Note 9 — Debt. Mortgage loans held-for-investment, net include $3.4 million and $6.1 million of allowance for expected credit losses at December 31, 2023 and 2022, respectively. (2)As of December 31, 2023 and 2022, balances for Mortgage loans held-for-investment, net include $0.6 million and $0.9 million, respectively, from a 50.0% owned joint venture, which the Company consolidates under U.S. Generally Accepted Accounting Principles ("U.S. GAAP" or "GAAP").

[3] As of December 31, 2023, non-controlling interests includes $0.8 million from a 50.0% owned joint venture, $1.0 million from a 53.1% owned subsidiary and $0.1 million from a 99.9% owned subsidiary which the Company consolidates. As of December 31, 2022, non-controlling interests includes $1.0 million from a 50.0% owned joint venture, $1.1 million from a 53.1% owned subsidiary and $0.1 million from a 99.9% owned subsidiary which the Company consolidates.