Investments in Affiliates (Tables)

9 Months Ended

Sep. 30, 2017

Investments In And Advances To Affiliates Schedule Of Investments [Abstract]

Summary of Transactions in, and Earnings from, Investments in PowerShares Treasury Collateral Portfolio

The following is a summary of the transactions in, and earnings from, investments in PowerShares Treasury Collateral Portfolio for the Three and Nine Months Ended September 30, 2017.

	Value 06/30/2017		Purchases at Cost		Proceeds from Sales		Change in Unrealized Appreciation (Depreciation)			Realized Gain (Loss)			Value 09/30/2017			Dividend Income
PowerShares Treasury Collateral Portfolio	$	—	$	80,006,724	$	—		$	121,726		$	—		$	80,128,450		$	—

	Value 12/31/2016		Purchases at Cost		Proceeds from Sales		Change in Unrealized Appreciation (Depreciation)			Realized Gain (Loss)			Value 09/30/2017			Dividend Income
PowerShares Treasury Collateral Portfolio	$	—	$	80,006,724	$	—		$	121,726		$	—		$	80,128,450		$	—