Annual report pursuant to Section 13 and 15(d)

FAIR VALUE OF FINANCIAL INSTRUMENTS - Change in Fair Value of Level 3 Investments (Details)

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FAIR VALUE OF FINANCIAL INSTRUMENTS - Change in Fair Value of Level 3 Investments (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Purchases, sales and repayments    
Transfers in or out of Level 3 $ 0 $ 0
Level 3 | Measured on a Recurring Basis | ABS - Non-Agency RMBS    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation    
Balance, beginning 3,052,000 2,953,000
Total gains (losses)    
Included in other comprehensive loss (242,000) (168,000)
Amortization included in interest income 462,000 375,000
Purchases, sales and repayments    
Proceeds (49,000) (108,000)
Balance, ending 3,223,000 3,052,000
Purchases 0 0
Sales $ 0 $ 0