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Investments (Tables)
 3 Months Ended
Sep. 30, 2017
Investments [Abstract]  
Schedule of derivative instruments in statement of financial position

Fair Value of Derivative Instruments, as of September 30, 2017

 
    Asset Derivatives   Liability Derivatives  
Derivatives   Statements of
Assets and Liabilities		   Unrealized
Gain		     Statements of
Assets and Liabilities		    Fair
Value		  
Interest Rate Risk   Receivable on open futures contracts   $ 240,407 *            
Interest Rate Risk   —     —     Written options, at fair value   $ (8,500 )**
                         
  * Represents cumulative appreciation of futures contracts as reported in the Statements of Assets and Liabilities.
  ** Represents fair value of options contracts as reported in the Statements of Assets and Liabilities.

 

Fair Value of Derivative Instruments, as of June 30, 2017

 

    Asset Derivatives   Liability Derivatives  
Derivatives   Statements of
Assets and Liabilities		   Unrealized
Gain		     Statements of
Assets and Liabilities		   Fair
Value		  
Interest Rate Risk   Receivable on open futures contracts   $ 21,795 *            
Interest Rate Risk   —     —     Written options, at fair value   $ (3,477 )**

 

  * Represents cumulative appreciation of futures contracts as reported in the Statements of Assets and Liabilities.
  ** Represents fair value of options contracts as reported in the Statements of Assets and Liabilities.
Schedule of derivative instruments, effect on other comprehensive income (loss)

The Effect of Derivative Instruments on the Statements of Operations

For the Three Months Ended September 30, 2017

 

Derivatives   Location of Gain (Loss) on Derivatives   Realized Loss
on
Derivatives
Recognized in
Income		     Change in Unrealized Gain (Loss)
on Derivatives Recognized in
 Income		  
Interest Rate Risk   Net realized loss on investments, futures and options contracts and/or Change in unrealized gain (loss) on investments, futures and options contracts   $ (108,952 )   $  221,731  
                     

The futures and options contracts open at September 30, 2017 are indicative of the activity for the three months ended September 30, 2017.

 

The Effect of Derivative Instruments on the Statements of Operations

For the Three Months Ended September 30, 2016

 
Derivatives   Location of Gain (Loss) on Derivatives   Realized
Loss on
Derivatives
Recognized in
Income		     Change in Unrealized Gain (Loss)
on Derivatives Recognized in
 Income		  
Interest Rate Risk   Net realized gain (loss) on investments, futures and options contracts and/or Change in unrealized gain (loss) on investments, futures and options contracts   $ (66,126)     $  274,014  
                     

The futures and options contracts open at September 30, 2016 are indicative of the activity for the three months ended September 30, 2016.