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Investments (Tables) | 9 Months Ended
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Mar. 31, 2016
Investments [Abstract] |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] | Fair Value of Derivative Instruments, as of March 31, 2016
|  | Assets Derivatives | Liability Derivatives
|  |  | Statements of |  |  |  | Statements of |  |  |
|  |  | Financial |  | Unrealized |  | Financial |  | Unrealized |
Derivatives |  |  | Condition |  | Gain |  | Condition |  | Loss |
Interest Rate Risk |  | Receivable on open futures contracts |  | $ | 48,032 | * |  | Written options, at fair value |  | $ | (190,117) | **
| * | Represents cumulative appreciation of futures contracts as reported in the Statements of Financial Condition.
| ** | Represents cumulative depreciation of futures contracts as reported in the Statements of Financial Condition.
Fair Value of Derivative Instruments, as of June 30, 2015
|  |  | Asset Derivatives | Liability Derivatives
|  |  | Statements of |  |  |  | Statements of |  |  |
|  |  | Financial |  | Unrealized |  | Financial |  | Unrealized |
Derivatives |  |  | Condition |  | Gain |  | Condition |  | Loss |
Interest Rate Risk |  | Receivable on open futures contracts |  | $ | 9,187 | * |  | Payable on open futures contracts |  | $ | (2,579) | **
Interest Rate Risk |  |  |  |  |  |  |  |  | Written options, at fair value |  | $ | (27,070) | ***
| * | Represents cumulative appreciation of futures contracts as reported in the Statements of Financial Condition.
| ** | Represents cumulative depreciation of futures contracts as reported in the Statements of Financial Condition.
| *** | Represents cumulative depreciation of options contracts as reported in the Statements of Financial Condition.
Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss) [Table Text Block] | The Effect of Derivative Instruments on the Statements of Operations For the Three Months Ended March 31, 2016
|  |  |  | Realized Gain |  |  |  |
|  |  |  | (Loss) on |  |  |  |
|  |  |  | Derivatives |  |  | Change in Unrealized gain (loss) |
|  |  |  | Recognized in |  |  | on Derivatives Recognized in |
Derivatives |  | Location of Gain(Loss) on Derivatives |  | Income |  |  | Income |
|  | Net realized gain (loss) on futures and options contracts |  |  |  |  |  |  |  |
|  | and/or Change in unrealized gain (loss) on |  |  |  |  |  |  |  |
Interest Rate Risk |  | futures and options contracts |  | $ | (719,469) |  |  | $ | (250,645) |
The futures and options contracts open at March 31, 2016 are indicative of the activity for the three months ended March 31, 2016. The Effect of Derivative Instruments on the Statements of Operations For the Nine Months Ended March 31, 2016
|  |  |  | Realized Gain |  |  |  |
|  |  |  | (Loss) on |  |  |  |
|  |  |  | Derivatives |  |  | Change in Unrealized gain (loss) |
|  |  |  | Recognized in |  |  | on Derivatives Recognized in |
Derivatives |  | Location of Gain(Loss) on Derivatives |  | Income |  |  | Income |
|  | Net realized gain (loss) on futures and options contracts |  |  |  |  |  |  |  |
|  | and/or Change in unrealized gain (loss) on |  |  |  |  |  |  |  |
Interest Rate Risk |  | futures and options contracts |  | $ | (726,684) |  |  | $ | (127,903) |
The futures and options contracts open at March 31, 2016 are indicative of the activity for the nine months ended March 31, 2016. The Effect of Derivative Instruments on the Statements of Operations For the Period from February 19, 2015 to March 31, 2015
|  |  |  | Realized Gain |  |  |  |
|  |  |  | (Loss) on |  |  |  |
|  |  |  | Derivatives |  |  | Change in Unrealized gain (loss) |
|  |  |  | Recognized in |  |  | on Derivatives Recognized in |
Derivatives |  | Location of Gain(Loss) on Derivatives |  | Income |  |  | Income |
|  | Net realized gain (loss) on futures and options contracts |  |  |  |  |  |  |  |
|  | and/or Change in unrealized gain (loss) on |  |  |  |  |  |  |  |
Interest Rate Risk |  | futures and options contracts |  | $ | (11,396) |  |  | $ | (156,031) |
The futures and options contracts open at March 31, 2015 are indicative of the activity for the period from February 19, 2015 to March 31, 2015. The Effect of Derivative Instruments on the Statements of Operations For the Period from February 19, 2015 to March 31, 2015
|  |  |  | Realized Gain |  |  |  |
|  |  |  | (Loss) on |  |  |  |
|  |  |  | Derivatives |  |  | Change in Unrealized gain (loss) |
|  |  |  | Recognized in |  |  | on Derivatives Recognized in |
Derivatives |  | Location of Gain(Loss) on Derivatives |  | Income |  |  | Income |
|  | Net realized gain (loss) on futures and options contracts |  |  |  |  |  |  |  |
|  | and/or Change in unrealized gain (loss) on |  |  |  |  |  |  |  |
Interest Rate Risk |  | futures and options contracts |  | $ | (11,396) |  |  | $ | (156,031) |
The futures and options contracts open at March 31, 2015 are indicative of the activity for the period from February 19, 2015 to March 31, 2015.

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- Definition Tabular disclosure of the effective portion of the gains and losses on derivative instruments designated (and non-derivative instruments) designated and qualifying in cash flow hedges and net investment hedges that was recognized in other comprehensive income (loss) during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 + Details
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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959 + Details
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