Note 3 - Trust Expenses (Details)	12 Months Ended
	Dec. 31, 2015 USD ($)
Note 3 - Trust Expenses (Details) [Line Items]
Sponsors Fee Annualized Accrual Rate Based On Daily Net Asset Value	0.50%
Maximum [Member]
Note 3 - Trust Expenses (Details) [Line Items]
Legal Fees Per Year	$ 100,000