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FINANCIAL HIGHLIGHTS (Details) - $ / shares	3 Months Ended
FINANCIAL HIGHLIGHTS (Details) - $ / shares	Mar. 31, 2024	Mar. 31, 2023
Per Share Operating Performance:
Net asset value, beginning of year	$ 35.23	$ 35.45
Total income (loss)	4.84	(1.62)
Total expenses	(0.08)	(0.06)
Net increase (decrease) in net asset value	4.76	(1.68)
Net asset value, end of year	$ 39.99	$ 33.77
Total Return	13.51%	(4.74%)
Ratios to Average Net Assets
Total income (loss)	12.77%	(4.45%)
Management fees	0.60%	0.60%
Total expenses excluding management fees	0.30%	0.14%
Net income (loss)	12.55%	(4.63%)