FINANCIAL HIGHLIGHTS (Details) - $ / shares	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Per Share Operating Performance:
Net asset value, beginning of year	$ 30.14	$ 27.39	$ 28.26
Total income (loss)	(1.51)	3.09	(0.61)
Total expenses	(0.34)	(0.34)	(0.26)
Net increase (decrease) in net asset value	(1.85)	2.75	(0.87)
Net asset value, end of year	$ 28.29	$ 30.14	$ 27.39
Total Return	(6.14%)	10.04%	(3.08%)
Ratios to Average Net Assets
Total income (loss)	(3.06%)	8.38%	(1.24%)
Management fees	0.75%	0.75%	0.75%
Total expenses excluding management fees	0.40%	0.39%	0.19%
Net income (loss)	(4.21%)	7.24%	(2.18%)