FINANCIAL HIGHLIGHTS (Details) - $ / shares	3 Months Ended	9 Months Ended
Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Per Share Operating Performance:
Net asset value, beginning of period	$ 7.46	$ 18.45	$ 14.22	$ 12.39
Total income (loss)	(0.63)	4.90	(7.35)	11.06
Total expenses	(0.02)	(0.07)	(0.06)	(0.17)
Net increase (decrease) in net asset value	(0.65)	4.83	(7.41)	10.89
Net asset value, end of period	$ 6.81	$ 23.28	$ 6.81	$ 23.28
Total Return	(8.71%)	26.18%	(52.11%)	87.89%
Ratios to Average Net Assets
Total income (loss)	(7.07%)	21.70%	(39.07%)	59.23%
Management fees	0.60%	0.60%	0.60%	0.60%
Total expenses excluding management fees	0.34%	0.47%	0.42%	0.43%
Net income (loss)	(7.31%)	21.43%	(39.84%)	58.45%