Schedule of Investments (USD $)	Mar. 31, 2013	Dec. 31, 2012
Fair Value	$ 912,356	$ 1,065,241
Investments in short-term investments, at cost	912,356	1,065,241
JP Morgan 100% U.S. Treasury Securities Money Market Fund Capital [Member]
Fair Value	912,356	1,065,241
Short-Term Investments
Principal Amount	912,356	1,065,241
Short-term investments, percentage of shareholders' capital	56.95%	55.86%
Total Short-Term Investments [Member]
Fair Value	912,356	1,065,241
Investments in short-term investments, at cost	912,356	1,065,241
Short-Term Investments
Short-term investments, percentage of shareholders' capital	56.95%	55.86%
Light Sweet Crude Oil Futures, MAY13 [Member]
Fair Value	3,208,590
U.S. Futures
Number of Contracts	33
Fair Value at Trade Date	3,054,080
Unrealized Appreciation (Depreciation)	154,510
S & P 500 E Mini Index Futures, JUN13 [Member]
Fair Value	3,203,535
U.S. Futures
Number of Contracts	41
Fair Value at Trade Date	3,154,337
Unrealized Appreciation (Depreciation)	(49,198)
Light Sweet Crude Oil Futures, FEB13 [Member]
Fair Value		3,856,440
U.S. Futures
Number of Contracts		42
Fair Value at Trade Date		3,647,080
Unrealized Appreciation (Depreciation)		209,360
S & P 500 E Mini Index Futures, MAR13 [Member]
Fair Value		3,905,275
U.S. Futures
Number of Contracts		55
Fair Value at Trade Date		3,884,699
Unrealized Appreciation (Depreciation)		(20,576)
Total U.S. Futures [Member]
U.S. Futures
Unrealized Appreciation (Depreciation)	$ 105,312	$ 188,784

Value of the investment at close of period. For schedules of investments that are categorized, the value would be aggregated by category. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 14

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-Article 12

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 12C

-Paragraph Column C

-Article 12

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

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-Subparagraph (SX 210.12-12C.Column C.7)

-URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611225-123010

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 14

-Paragraph Column E

-Article 12

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

-SubTopic 320

-Section S99

-Paragraph 6

-Subparagraph (SX 210.12-14.Column E.2,3)

-URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611322-123010

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 12C

-Paragraph 7

-Article 12

Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

-SubTopic 320

-Section S99

-Paragraph 1

-Subparagraph (SX 210.12-12.Column C.3,4)

-URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611133-123010

Reference 8: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 13

-Paragraph 6

-Article 12

Reference 9: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 13

-Paragraph Column C

-Article 12

Reference 10: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 12

-Paragraph Column C

-Article 12

Reference 11: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

-SubTopic 320

-Section S99

-Paragraph 5

-Subparagraph (SX 210.12-13.Column C.6)

-URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611282-123010

Reference 12: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 12

-Paragraph 3, 4

-Article 12

+ Details

- Definition

Balance held at close of period in number of contracts.

+ References+ Details

- Definition

For investments which are quantified by principal amount, the principle balance held at close of period.

+ References+ Details

FactorShares 2X: Oil Bull/S&P500 Bear 10-Q