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Summary of Significant Accounting Policies (Details) - USD ($)	Sep. 30, 2016	Jun. 30, 2016	Sep. 30, 2015	Jun. 30, 2015	Jan. 08, 2015	Jun. 30, 2014
Jointly Owned Utility Plant Interests [Line Items]
Royal Gold initial investment					$ 5,000,000
Contango's percentage of interest in Joint Venture Company	85.00%		100.00%
Equity Method Investments	$ 0.0	$ 0		$ 0		$ 0
Common stock, shares authorized	30,000,000	30,000,000
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares issued	4,073,403	3,958,540
Common stock, shares outstanding	4,073,403	3,958,540

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