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