Note 10 - Fair Value of Financial Instruments - Schedule of Carrying Values and Fair Values of Financial Assets and Liabilities Recorded at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021 |
Common stock investment, at fair value | $ 86,808 | $ 58,460 |
CMBS Structured Pass Through Certificates [Member] | | |
Debt security, investment, at fair value | 63,003 | 69,816 |
MSCR Notes [Member] | | |
Debt security, investment, at fair value | 8,809 | 0 |
SFR Pass-though Certificates [Member] | | |
Debt security, investment, at fair value | 19,466 | $ 0 |
Fair Value, Inputs, Level 3 [Member] | | |
Common stock investment, at fair value | 58,923 | |
Fair Value, Recurring [Member] | | |
Cash and cash equivalents | 52,682 | |
Restricted cash | 1,261 | |
Bridge loan, net | 266,779 | |
Real estate investment, net | 60,428 | |
Common stock investment, at fair value | 86,808 | |
Accrued interest | 10,795 | |
Accounts receivable and other assets | 1,361 | |
Assets, Fair Value Disclosure, Total | 7,871,279 | |
Secured financing agreements, net | 722,163 | |
Master repurchase agreements | 312,355 | |
Unsecured notes, net | 191,451 | |
Mortgages payable, net | 30,587 | |
Accounts payable and other accrued liabilities | 8,274 | |
Accrued interest payable | 4,493 | |
Due to brokers for unsecured notes purchased, not yet settled | 1,950 | |
Liabilities, Fair Value Disclosure, Total | 7,366,843 | |
Fair Value, Recurring [Member] | CMBS Structured Pass Through Certificates [Member] | | |
Debt security, investment, at fair value | 63,003 | |
Fair Value, Recurring [Member] | MSCR Notes [Member] | | |
Debt security, investment, at fair value | 8,809 | |
Fair Value, Recurring [Member] | SFR Pass-though Certificates [Member] | | |
Debt security, investment, at fair value | 19,466 | |
Fair Value, Recurring [Member] | Variable Interest Entity, Primary Beneficiary [Member] | | |
Bonds payable held in variable interest entities, at fair value | 6,095,570 | |
Fair Value, Recurring [Member] | Bridge Loan [Member] | | |
Bridge loan, net | 13,941 | |
Fair Value, Recurring [Member] | Mortgages [Member] | | |
Bridge loan, net | 737,402 | |
Fair Value, Recurring [Member] | Mortgages [Member] | Variable Interest Entity, Primary Beneficiary [Member] | | |
Bridge loan, net | 6,548,544 | |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | | |
Cash and cash equivalents | 52,682 | |
Restricted cash | 1,261 | |
Bridge loan, net | 0 | |
Real estate investment, net | 0 | |
Common stock investment, at fair value | 0 | |
Accrued interest | 10,795 | |
Accounts receivable and other assets | 1,361 | |
Assets, Fair Value Disclosure, Total | 66,099 | |
Secured financing agreements, net | 0 | |
Master repurchase agreements | 0 | |
Unsecured notes, net | 0 | |
Mortgages payable, net | 0 | |
Accounts payable and other accrued liabilities | 8,274 | |
Accrued interest payable | 4,493 | |
Due to brokers for unsecured notes purchased, not yet settled | 1,950 | |
Liabilities, Fair Value Disclosure, Total | 14,717 | |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | CMBS Structured Pass Through Certificates [Member] | | |
Debt security, investment, at fair value | 0 | |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | MSCR Notes [Member] | | |
Debt security, investment, at fair value | 0 | |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | SFR Pass-though Certificates [Member] | | |
Debt security, investment, at fair value | 0 | |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Variable Interest Entity, Primary Beneficiary [Member] | | |
Bonds payable held in variable interest entities, at fair value | 0 | |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Bridge Loan [Member] | | |
Bridge loan, net | 0 | |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Mortgages [Member] | | |
Bridge loan, net | 0 | |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Mortgages [Member] | Variable Interest Entity, Primary Beneficiary [Member] | | |
Bridge loan, net | 0 | |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | | |
Cash and cash equivalents | 0 | |
Restricted cash | 0 | |
Bridge loan, net | 0 | |
Real estate investment, net | 0 | |
Common stock investment, at fair value | 27,885 | |
Accrued interest | 0 | |
Accounts receivable and other assets | 0 | |
Assets, Fair Value Disclosure, Total | 6,667,707 | |
Secured financing agreements, net | 0 | |
Master repurchase agreements | 0 | |
Unsecured notes, net | 191,451 | |
Mortgages payable, net | 0 | |
Accounts payable and other accrued liabilities | 0 | |
Accrued interest payable | 0 | |
Due to brokers for unsecured notes purchased, not yet settled | | |
Liabilities, Fair Value Disclosure, Total | 6,287,021 | |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | CMBS Structured Pass Through Certificates [Member] | | |
Debt security, investment, at fair value | 63,003 | |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | MSCR Notes [Member] | | |
Debt security, investment, at fair value | 8,809 | |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | SFR Pass-though Certificates [Member] | | |
Debt security, investment, at fair value | 19,466 | |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Variable Interest Entity, Primary Beneficiary [Member] | | |
Bonds payable held in variable interest entities, at fair value | 6,095,570 | |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Bridge Loan [Member] | | |
Bridge loan, net | 0 | |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Mortgages [Member] | | |
Bridge loan, net | 0 | |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Mortgages [Member] | Variable Interest Entity, Primary Beneficiary [Member] | | |
Bridge loan, net | 6,548,544 | |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | | |
Cash and cash equivalents | 0 | |
Restricted cash | 0 | |
Bridge loan, net | 266,779 | |
Real estate investment, net | 60,428 | |
Common stock investment, at fair value | 58,923 | |
Accrued interest | 0 | |
Accounts receivable and other assets | 0 | |
Assets, Fair Value Disclosure, Total | 1,137,473 | |
Secured financing agreements, net | 722,163 | |
Master repurchase agreements | 312,355 | |
Unsecured notes, net | 0 | |
Mortgages payable, net | 30,587 | |
Accounts payable and other accrued liabilities | 0 | |
Accrued interest payable | 0 | |
Due to brokers for unsecured notes purchased, not yet settled | | |
Liabilities, Fair Value Disclosure, Total | 1,065,105 | |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | CMBS Structured Pass Through Certificates [Member] | | |
Debt security, investment, at fair value | 0 | |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | MSCR Notes [Member] | | |
Debt security, investment, at fair value | 0 | |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | SFR Pass-though Certificates [Member] | | |
Debt security, investment, at fair value | 0 | |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Variable Interest Entity, Primary Beneficiary [Member] | | |
Bonds payable held in variable interest entities, at fair value | 0 | |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Bridge Loan [Member] | | |
Bridge loan, net | 13,941 | |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Mortgages [Member] | | |
Bridge loan, net | 737,402 | |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Mortgages [Member] | Variable Interest Entity, Primary Beneficiary [Member] | | |
Bridge loan, net | 0 | |
Fair Value, Recurring [Member] | Reported Value Measurement [Member] | | |
Cash and cash equivalents | 52,682 | |
Restricted cash | 1,261 | |
Bridge loan, net | 258,577 | |
Real estate investment, net | 60,428 | |
Common stock investment, at fair value | 86,808 | |
Accrued interest | 10,795 | |
Accounts receivable and other assets | 1,361 | |
Assets, Fair Value Disclosure, Total | 7,861,209 | |
Secured financing agreements, net | 693,782 | |
Master repurchase agreements | 312,355 | |
Unsecured notes, net | 198,044 | |
Mortgages payable, net | 32,200 | |
Accounts payable and other accrued liabilities | 8,274 | |
Accrued interest payable | 4,493 | |
Due to brokers for unsecured notes purchased, not yet settled | 1,950 | |
Liabilities, Fair Value Disclosure, Total | 7,346,668 | |
Fair Value, Recurring [Member] | Reported Value Measurement [Member] | CMBS Structured Pass Through Certificates [Member] | | |
Debt security, investment, at fair value | 63,003 | |
Fair Value, Recurring [Member] | Reported Value Measurement [Member] | MSCR Notes [Member] | | |
Debt security, investment, at fair value | 8,809 | |
Fair Value, Recurring [Member] | Reported Value Measurement [Member] | SFR Pass-though Certificates [Member] | | |
Debt security, investment, at fair value | 19,466 | |
Fair Value, Recurring [Member] | Reported Value Measurement [Member] | Variable Interest Entity, Primary Beneficiary [Member] | | |
Bonds payable held in variable interest entities, at fair value | 6,095,570 | |
Fair Value, Recurring [Member] | Reported Value Measurement [Member] | Bridge Loan [Member] | | |
Bridge loan, net | 13,468 | |
Fair Value, Recurring [Member] | Reported Value Measurement [Member] | Mortgages [Member] | | |
Bridge loan, net | 736,007 | |
Fair Value, Recurring [Member] | Reported Value Measurement [Member] | Mortgages [Member] | Variable Interest Entity, Primary Beneficiary [Member] | | |
Bridge loan, net | $ 6,548,544 | |