Statement of Changes in Net Assets - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Statements of Changes in Net Assets [Abstract]
Opening balance (in Shares)	4,750,000	5,200,000	5,200,000
Creations (in Shares)	450,000		600,000
Redemptions (in Shares)	(150,000)		(1,050,000)
Closing balance (in Shares)	5,050,000		4,750,000
Opening balance	$ 399,557	$ 610,620	$ 610,620
Net investment loss	(640)	(885)	(3,123)
Realized loss on investment in platinum	(8,862)		(32,703)
Change in unrealized gain / (loss) on investment in platinum	55,907	$ (36,856)	(133,465)
Change in unrealized gain on unsettled creations or redemptions	19
Creations	41,460		62,044
Redemptions	(12,697)		(103,816)
Closing balance	$ 474,744		$ 399,557