Consolidated Statements of Changes in Net Assets (Unaudited) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2019
INCREASE FROM OPERATIONS
Net investment income		$ 18,560,771	$ 17,128,556
Foreign exchange (loss) gain	$ 14,896	15,991	(5,717)
Net change in unrealized depreciation on investments	(4,114,774)	(13,845,677)	(2,250,398)
Net increase from operations		4,731,085	14,872,441
DECREASE FROM DISTRIBUTIONS
Distributions to unitholders		(21,424,787)	(20,284,761)
INCREASE (DECREASE) FROM CAPITAL TRANSACTIONS
Issuance of capital units		3,580,000
Repurchase of units		(6,963,843)	(10,076,392)
Distribution and other fees		296,000	450,000
Offering costs			(26,690)
Net increase from capital transactions		3,890,467	17,900,594
NET (DECREASE) INCREASE IN NET ASSETS		(12,803,235)	12,488,274
Net assets at beginning of period		369,595,560	360,070,359
Net assets at end of period	356,792,325	356,792,325	372,558,633
Class A Units [Member]
DECREASE FROM DISTRIBUTIONS
Distributions to unitholders		(8,283,084)	(8,264,383)
INCREASE (DECREASE) FROM CAPITAL TRANSACTIONS
Issuance of capital units		3,259,118	3,337,016
Net assets at beginning of period		143,313,977
Net assets at end of period	137,555,215	137,555,215
Class C Units [Member]
DECREASE FROM DISTRIBUTIONS
Distributions to unitholders		(3,649,963)	(3,678,026)
INCREASE (DECREASE) FROM CAPITAL TRANSACTIONS
Issuance of capital units		1,613,550	1,756,760
Net assets at beginning of period		64,117,584
Net assets at end of period	60,737,939	60,737,939
Class I Units [Member]
DECREASE FROM DISTRIBUTIONS
Distributions to unitholders		(4,861,496)	(4,865,378)
INCREASE (DECREASE) FROM CAPITAL TRANSACTIONS
Issuance of capital units		2,105,920	2,039,900
Net assets at beginning of period		83,964,495
Net assets at end of period	80,388,273	80,388,273
Class W Units [Member]
DECREASE FROM DISTRIBUTIONS
Distributions to unitholders		(10,261)	(10,501)
INCREASE (DECREASE) FROM CAPITAL TRANSACTIONS
Net assets at beginning of period		195,021
Net assets at end of period	187,237	187,237
Class Y Units [Member]
DECREASE FROM DISTRIBUTIONS
Distributions to unitholders		(726,736)	(553,780)
INCREASE (DECREASE) FROM CAPITAL TRANSACTIONS
Issuance of capital units		3,579,722	420,000
Net assets at beginning of period		10,413,945
Net assets at end of period	13,346,540	13,346,540
Class Z Units [Member]
DECREASE FROM DISTRIBUTIONS
Distributions to unitholders		(3,893,247)	(2,912,693)
INCREASE (DECREASE) FROM CAPITAL TRANSACTIONS
Issuance of capital units			$ 20,000,000
Net assets at beginning of period		67,590,538
Net assets at end of period	$ 64,577,121	$ 64,577,121