Statements of Assets and Liabilities (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Statements of Assets and Liabilities [Abstract]
Investment in palladium at cost	$ 112,344	$ 155,318
Common stock, shares authorized	Unlimited	Unlimited
Common stock, par value
Common stock, shares issued	1,550,000	2,400,000
Common stock, shares outstanding	1,550,000	2,400,000
Net asset value per share	$ 119.66	$ 100.65