QUARTERLY RESULTS - (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Interest Income	$ 37,529,000	$ 35,907,000	$ 36,455,000	$ 32,433,000	$ 37,002,000	$ 39,054,000	$ 38,590,000	$ 39,935,000
Interest expense	20,022,000	22,321,000	22,431,000	18,892,000	19,739,000	18,893,000	16,579,000	15,149,000	$ 83,666,000	$ 70,360,000	$ 41,671,000
Net interest income	17,507,000	13,586,000	14,024,000	13,541,000	17,263,000	20,161,000	22,011,000	24,786,000
Realized And Unrealized Gains	3,841,000	(19,431,000)	(7,670,000)	(748,000)	(40,707,000)	(20,150,000)	(17,734,000)	(38,055,000)
Net portfolio income	21,348,000	(5,845,000)	6,354,000	12,793,000	(23,444,000)	11,000	4,277,000	(13,269,000)
Management Fees	1,856,000	1,791,000	1,653,000	1,608,000	1,836,000	1,873,000	1,967,000	2,094,000
Other Expenses	880,000	841,000	1,168,000	588,000	1,117,000	1,097,000	964,000	1,014,000
Total expenses	2,736,000	2,632,000	2,821,000	2,196,000	2,953,000	2,970,000	2,931,000	3,108,000
Net income (loss)	$ 18,612,000	$ (8,477,000)	$ 3,533,000	$ 10,597,000	$ (26,397,000)	$ (2,959,000)	$ 1,346,000	$ (16,377,000)
Earnings Per Share, Basic	$ 0.29	$ (0.14)	$ 0.07	$ 0.22	$ (0.52)	$ (0.06)	$ 0.03	$ (0.31)	$ 0.43	$ (0.85)	$ 0.05
Earnings Per Share Diluted	$ 0.29	$ (0.14)	$ 0.07	$ 0.22	$ (0.52)	$ (0.06)	$ 0.03	$ (0.31)	$ 0.43	$ (0.85)	$ 0.05
Weighted Average Number Of Basic Shares Outstanding	63,124,000	60,419,000	52,601,000	48,905,000	51,188,000	52,035,000	52,587,000	53,066,000	56,328,027	52,198,175	41,062,039
Dividends Declared Per Common Share	$ 0.24	$ 0.24	$ 0.24	$ 0.24	$ 0.24	$ 0.25	$ 0.27	$ 0.31	$ 0.96	$ 1.07	$ 1.68