MORTGAGE-BACKED SECURITIES - MBS Portfolio (Details) - USD ($) |
Sep. 30, 2020 |
Jun. 30, 2020 |
Mar. 31, 2020 |
Dec. 31, 2019 |
---|---|---|---|---|
Schedule of Trading Securities and Other Trading Assets [Line Items] | ||||
Fair Value | $ 73,144,529 | $ 52,800,000 | $ 54,400,000 | $ 217,840,953 |
Fixed Rate Mortgages [Member] | ||||
Schedule of Trading Securities and Other Trading Assets [Line Items] | ||||
Fair Value | 72,782,000 | 216,231,000 | ||
Interest Only Securities [Member] | ||||
Schedule of Trading Securities and Other Trading Assets [Line Items] | ||||
Fair Value | 334,000 | 1,024,000 | ||
Inverse Interest Only [Member] | ||||
Schedule of Trading Securities and Other Trading Assets [Line Items] | ||||
Fair Value | $ 29,000 | $ 586,000 |