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FINANCIAL HIGHLIGHTS (Details) - $ / shares	3 Months Ended		6 Months Ended
FINANCIAL HIGHLIGHTS (Details) - $ / shares	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Per Share Operating Performance:
Net asset value, beginning of period	$ 38.21	$ 39.99	$ 38.01	$ 35.23
Total income (loss)	(2.94)	0.64	(2.65)	5.48
Total expenses	(0.08)	(0.09)	(0.17)	(0.17)
Net increase (decrease) in net asset value	(3.02)	0.55	(2.82)	5.31
Net asset value, end of period	$ 35.19	$ 40.54	$ 35.19	$ 40.54
Total Return	(7.90%)	1.38%	(7.42%)	15.07%
Ratios to Average Net Assets
Total income (loss)	(9.47%)	1.61%	(7.69%)	14.59%
Management fees	0.60%	0.60%	0.60%	0.60%
Total expenses excluding management fees	0.36%	0.31%	0.37%	0.30%
Net income (loss)	(9.71%)	1.39%	(8.17%)	14.14%