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Note 10 - Investment Valuation (Tables) (iShares S&P Commodity-Indexed Investing Pool LLC [Member])
9 Months Ended
Sep. 30, 2013
iShares S&P Commodity-Indexed Investing Pool LLC [Member]
 
Note 10 - Investment Valuation (Tables) [Line Items]  
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Table Text Block]
   

Level 1

   

Level 2

   

Level 3

   

Total

 

September 30, 2013

                               

Futures(a)

  $ (74,864,742 )   $     $     $ (74,864,742 )

U.S. Treasury bills

          1,251,930,274             1,251,930,274  
                                 

December 31, 2012

                               

Futures(a)

  $ (64,502,960 )   $     $     $ (64,502,960 )

U.S. Treasury bills

          1,111,734,878             1,111,734,878