Consolidated Statements of Changes in Net Assets (Unaudited) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Jun. 30, 2019
INCREASE FROM OPERATIONS
Net investment income		$ 12,056,233	$ 11,168,904
Foreign exchange (loss) gain	$ 4,167	1,095	277
Net change in unrealized depreciation on investments	(1,052,185)	(9,730,903)	(1,903,180)
Net increase from operations		2,326,425	9,266,001
DECREASE FROM DISTRIBUTIONS
Distributions to unitholders		(14,208,249)	(13,363,318)
INCREASE (DECREASE) FROM CAPITAL TRANSACTIONS
Issuance of capital units		2,606,000
Repurchase of units		(4,624,739)	(7,687,796)
Distribution and other fees		158,000	319,000
Net increase (decrease) from capital transactions		2,787,430	(2,202,965)
NET DECREASE IN NET ASSETS		(9,094,394)	(6,300,282)
Net assets at beginning of period		369,595,560	360,070,359
Net assets at end of period	360,501,166	360,501,166	353,770,077
Class A Units [Member]
DECREASE FROM DISTRIBUTIONS
Distributions to unitholders		(5,497,042)	(5,494,697)
INCREASE (DECREASE) FROM CAPITAL TRANSACTIONS
Issuance of capital units		2,174,806	2,224,545
Net assets at beginning of period		143,313,977
Net assets at end of period	139,144,857	139,144,857
Class C Units [Member]
DECREASE FROM DISTRIBUTIONS
Distributions to unitholders		(2,424,382)	(2,446,249)
INCREASE (DECREASE) FROM CAPITAL TRANSACTIONS
Issuance of capital units		1,127,988	1,169,524
Net assets at beginning of period		64,117,584
Net assets at end of period	61,553,564	61,553,564
Class I Units [Member]
DECREASE FROM DISTRIBUTIONS
Distributions to unitholders		(3,226,518)	(3,229,189)
INCREASE (DECREASE) FROM CAPITAL TRANSACTIONS
Issuance of capital units		1,345,375	1,351,762
Net assets at beginning of period		83,964,495
Net assets at end of period	81,605,326	81,605,326
Class W Units [Member]
DECREASE FROM DISTRIBUTIONS
Distributions to unitholders		(6,786)	(6,963)
INCREASE (DECREASE) FROM CAPITAL TRANSACTIONS
Net assets at beginning of period		195,021
Net assets at end of period	189,770	189,770
Class Y Units [Member]
DECREASE FROM DISTRIBUTIONS
Distributions to unitholders		(467,495)	(365,083)
INCREASE (DECREASE) FROM CAPITAL TRANSACTIONS
Issuance of capital units		2,606,000	420,000
Net assets at beginning of period		10,413,945
Net assets at end of period	12,561,547	12,561,547
Class Z Units [Member]
DECREASE FROM DISTRIBUTIONS
Distributions to unitholders		(2,586,026)	$ (1,821,137)
INCREASE (DECREASE) FROM CAPITAL TRANSACTIONS
Net assets at beginning of period		67,590,538
Net assets at end of period	$ 65,446,102	$ 65,446,102