Schedule of Investments (Unaudited) - Futures Contracts (Parenthetical)	3 Months Ended
	Mar. 31, 2016 Contract
FNX-ICE Dollar Index (8,658 contracts, settlement date June 13, 2016) [Member]
Investment Holdings [Line Items]
Open Future Contracts Written, Number of Contracts	8,658
Futures Contract Indexed to Issuer's Equity, Settlement Date or Dates	Jun. 13, 2016
FNX-ICE Dollar Index (11,482 Contracts, Settlement Date March 14, 2016) [Member]
Investment Holdings [Line Items]
Open Future Contracts Written, Number of Contracts	11,482
Futures Contract Indexed to Issuer's Equity, Settlement Date or Dates	Mar. 14, 2016