DERIVATIVE INSTRUMENTS HEDGING AND NON-HEDGING ACTIVITIES - Gains and Losses on Derivative Contracts (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Interest rate:
Amount of realized gain (loss)	$ 25,984,870	$ 2,219,719
Amount of unrealized appreciation (depreciation)	(5,349,613)	(2,704,413)
Total	20,635,257	(484,694)
Eurodollar Futures
Interest rate:
Amount of realized gain (loss)	25,984,870	2,219,719
Amount of unrealized appreciation (depreciation)	(5,349,613)	(2,704,413)
Total	$ 20,635,257	$ (484,694)