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 | Sep. 30, 2022 | Dec. 31, 2021 |
Common stock investment, at fair value | $ 83,619 | $ 58,460 |
CMBS Structured Pass Through Certificates [Member] | | |
Debt security, investment, at fair value | 49,758 | 69,816 |
MSCR Notes [Member] | | |
Debt security, investment, at fair value | 10,218 | 0 |
Collateralized Mortgage-Backed Securities [Member] | | |
Debt security, investment, at fair value | 33,650 | $ 0 |
Fair Value, Inputs, Level 3 [Member] | | |
Common stock investment, at fair value | 55,734 | |
Fair Value, Recurring [Member] | | |
Cash and cash equivalents | 22,100 | |
Restricted cash | 4,382 | |
Real estate investment, net | 59,940 | |
Loan | 288,954 | |
Common stock investment, at fair value | 83,619 | |
Accrued interest | 13,691 | |
Accounts receivable and other assets | 1,575 | |
Proceeds held in escrow for unsettled purchase | 3,990 | |
Assets, Fair Value Disclosure, Total | 8,282,158 | |
Secured financing agreements, net | 700,877 | |
Master repurchase agreements | 351,037 | |
Unsecured notes, net | 182,779 | |
Mortgages payable, net | 27,213 | |
Accounts payable and other accrued liabilities | 6,131 | |
Accrued interest payable | 8,249 | |
Due to brokers for unsecured notes purchased, not yet settled | 7,980 | |
Liabilities, Fair Value Disclosure, Total | 7,772,763 | |
Fair Value, Recurring [Member] | CMBS Structured Pass Through Certificates [Member] | | |
Debt security, investment, at fair value | 49,758 | |
Fair Value, Recurring [Member] | MSCR Notes [Member] | | |
Debt security, investment, at fair value | 10,218 | |
Fair Value, Recurring [Member] | Collateralized Mortgage-Backed Securities [Member] | | |
Debt security, investment, at fair value | 33,650 | |
Fair Value, Recurring [Member] | Variable Interest Entity, Primary Beneficiary [Member] | | |
Bonds payable held in variable interest entities, at fair value | 6,488,498 | |
Fair Value, Recurring [Member] | Mortgages [Member] | | |
Loan | 730,152 | |
Fair Value, Recurring [Member] | Mortgages [Member] | Variable Interest Entity, Primary Beneficiary [Member] | | |
Loan | 6,980,129 | |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | | |
Cash and cash equivalents | 22,100 | |
Restricted cash | 4,382 | |
Real estate investment, net | 0 | |
Loan | 0 | |
Common stock investment, at fair value | 0 | |
Accrued interest | 13,691 | |
Accounts receivable and other assets | 1,575 | |
Proceeds held in escrow for unsettled purchase | 0 | |
Assets, Fair Value Disclosure, Total | 41,748 | |
Secured financing agreements, net | 0 | |
Master repurchase agreements | 0 | |
Unsecured notes, net | 0 | |
Mortgages payable, net | 0 | |
Accounts payable and other accrued liabilities | 6,131 | |
Accrued interest payable | 8,249 | |
Due to brokers for unsecured notes purchased, not yet settled | 7,980 | |
Liabilities, Fair Value Disclosure, Total | 22,360 | |
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] | Collateralized Mortgage-Backed Securities [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] | Mortgages [Member] | | |
Loan | 0 | |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Mortgages [Member] | Variable Interest Entity, Primary Beneficiary [Member] | | |
Loan | 0 | |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | | |
Cash and cash equivalents | 0 | |
Restricted cash | 0 | |
Real estate investment, net | 0 | |
Loan | 0 | |
Common stock investment, at fair value | 27,885 | |
Accrued interest | 0 | |
Accounts receivable and other assets | 0 | |
Proceeds held in escrow for unsettled purchase | 3,990 | |
Assets, Fair Value Disclosure, Total | 7,105,630 | |
Secured financing agreements, net | 0 | |
Master repurchase agreements | 0 | |
Unsecured notes, net | 182,779 | |
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 | 6,671,277 | |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | CMBS Structured Pass Through Certificates [Member] | | |
Debt security, investment, at fair value | 49,758 | |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | MSCR Notes [Member] | | |
Debt security, investment, at fair value | 10,218 | |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage-Backed Securities [Member] | | |
Debt security, investment, at fair value | 33,650 | |
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 | 6,488,498 | |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Mortgages [Member] | | |
Loan | 0 | |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Mortgages [Member] | Variable Interest Entity, Primary Beneficiary [Member] | | |
Loan | 6,980,129 | |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | | |
Cash and cash equivalents | 0 | |
Restricted cash | 0 | |
Real estate investment, net | 59,940 | |
Loan | 288,954 | |
Common stock investment, at fair value | 55,734 | |
Accrued interest | 0 | |
Accounts receivable and other assets | 0 | |
Proceeds held in escrow for unsettled purchase | 0 | |
Assets, Fair Value Disclosure, Total | 1,134,780 | |
Secured financing agreements, net | 700,877 | |
Master repurchase agreements | 351,037 | |
Unsecured notes, net | 0 | |
Mortgages payable, net | 27,213 | |
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 | 1,079,127 | |
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] | Collateralized Mortgage-Backed Securities [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] | Mortgages [Member] | | |
Loan | 730,152 | |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Mortgages [Member] | Variable Interest Entity, Primary Beneficiary [Member] | | |
Loan | 0 | |
Fair Value, Recurring [Member] | Reported Value Measurement [Member] | | |
Cash and cash equivalents | 22,100 | |
Restricted cash | 4,382 | |
Real estate investment, net | 59,940 | |
Loan | 283,866 | |
Common stock investment, at fair value | 83,619 | |
Accrued interest | 13,691 | |
Accounts receivable and other assets | 1,575 | |
Proceeds held in escrow for unsettled purchase | 3,990 | |
Assets, Fair Value Disclosure, Total | 8,275,922 | |
Secured financing agreements, net | 688,502 | |
Master repurchase agreements | 351,037 | |
Unsecured notes, net | 198,242 | |
Mortgages payable, net | 32,212 | |
Accounts payable and other accrued liabilities | 6,131 | |
Accrued interest payable | 8,249 | |
Due to brokers for unsecured notes purchased, not yet settled | 7,980 | |
Liabilities, Fair Value Disclosure, Total | 7,780,851 | |
Fair Value, Recurring [Member] | Reported Value Measurement [Member] | CMBS Structured Pass Through Certificates [Member] | | |
Debt security, investment, at fair value | 49,758 | |
Fair Value, Recurring [Member] | Reported Value Measurement [Member] | MSCR Notes [Member] | | |
Debt security, investment, at fair value | 10,218 | |
Fair Value, Recurring [Member] | Reported Value Measurement [Member] | Collateralized Mortgage-Backed Securities [Member] | | |
Debt security, investment, at fair value | 33,650 | |
Fair Value, Recurring [Member] | Reported Value Measurement [Member] | Variable Interest Entity, Primary Beneficiary [Member] | | |
Bonds payable held in variable interest entities, at fair value | 6,488,498 | |
Fair Value, Recurring [Member] | Reported Value Measurement [Member] | Mortgages [Member] | | |
Loan | 729,004 | |
Fair Value, Recurring [Member] | Reported Value Measurement [Member] | Mortgages [Member] | Variable Interest Entity, Primary Beneficiary [Member] | | |
Loan | $ 6,980,129 | |