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Investments (Details) - Interest Rate Risk [Member] - USD ($)
Mar. 31, 2016
Jun. 30, 2015
Receivable on open futures contracts [1] $ 48,032 $ 9,187
Payable on open futures contracts [2]   (2,579)
Written options, at fair value $ (190,117) [2] $ (27,070) [3]
[1] Represents cumulative appreciation of futures contracts as reported in the Statements of Financial Condition.
[2] Represents cumulative depreciation of futures contracts as reported in the Statements of Financial Condition.
[3] Represents cumulative depreciation of options contracts as reported in the Statements of Financial Condition.