Schedule of Investments (Unaudited) - Futures Contracts - USD ($)		Mar. 31, 2016	Dec. 31, 2015
Total Commodity Futures Contracts [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation/(Depreciation) as a Percentage of Shareholders’ Equity			(12.19%)
Unrealized Appreciation/ (Depreciation)	[1]		$ (13,891,219)
Notional Market Value			$ 113,993,494
LME Aluminum (1,012 contracts, settlement date November 14, 2016)
Schedule of Investments [Line Items]
Unrealized Appreciation/(Depreciation) as a Percentage of Shareholders’ Equity			(1.49%)
Unrealized Appreciation/ (Depreciation)	[1]		$ (1,693,825)
Notional Market Value			$ 38,949,351
LME Copper (314 contracts, settlement date February 15, 2016)
Schedule of Investments [Line Items]
Unrealized Appreciation/(Depreciation) as a Percentage of Shareholders’ Equity			0.90%
Unrealized Appreciation/ (Depreciation)	[1]		$ 1,026,775
Notional Market Value			$ 36,983,312
LME Zinc (949 contracts, settlement date February 15, 2016)
Schedule of Investments [Line Items]
Unrealized Appreciation/(Depreciation) as a Percentage of Shareholders’ Equity			(11.60%)
Unrealized Appreciation/ (Depreciation)	[1]		$ (13,224,169)
Notional Market Value			$ 38,060,831
Total Commodity Futures Contracts Purchased [Member] | LME Aluminum (863 contracts, settlement date November 14, 2016)
Schedule of Investments [Line Items]
Unrealized Appreciation/(Depreciation) as a Percentage of Shareholders’ Equity		(1.38%)
Unrealized Appreciation/ (Depreciation)	[1]	$ (1,406,369)
Notional Market Value		$ 33,203,925
Total Commodity Futures Contracts Purchased [Member] | LME Copper (268 contracts, settlement date May 16, 2016)
Schedule of Investments [Line Items]
Unrealized Appreciation/(Depreciation) as a Percentage of Shareholders’ Equity		1.50%
Unrealized Appreciation/ (Depreciation)	[1]	$ 1,523,706
Notional Market Value		$ 32,551,950
Total Commodity Futures Contracts Purchased [Member] | LME Zinc (789 contracts, settlement date December 19, 2016)
Schedule of Investments [Line Items]
Unrealized Appreciation/(Depreciation) as a Percentage of Shareholders’ Equity		5.29%
Unrealized Appreciation/ (Depreciation)	[1]	$ 5,381,494
Notional Market Value		$ 36,037,575
Total Commodity Futures Contracts Purchased [Member] | Total Commodity Futures Contracts [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation/(Depreciation) as a Percentage of Shareholders’ Equity		5.41%
Unrealized Appreciation/ (Depreciation)	[1]	$ 5,498,831
Notional Market Value		$ 101,793,450

[1] Unrealized appreciation/(depreciation) is presented above, net by contract.