Investments in Affiliates (Tables)

3 Months Ended

Mar. 31, 2020

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

Summary of Transactions in, and Earnings from, Investments in Affiliates (Excluding Affiliated Money Market Funds)

The following is a summary of the transactions in, and earnings from, investments in affiliates (excluding affiliated money market funds) for the three months ended March 31, 2020 and 2019.

	Value 12/31/2019		Purchases at Cost		Proceeds from Sales		Change in Unrealized Appreciation (Depreciation)		Realized Gain (Loss)		Value 03/31/2020		Dividend Income
Invesco Treasury Collateral ETF	$	79,893,780	$	—	$	—	$	492,050	$	—	$	80,385,830	$	332,997
	Value 12/31/2018		Purchases at Cost		Proceeds from Sales		Change in Unrealized Appreciation (Depreciation)		Realized Gain (Loss)		Value 03/31/2019		Dividend Income
Invesco Treasury Collateral ETF	$	79,818,080	$	—	$	—	$	37,850	$	—	$	79,855,930	$	461,186