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Summary of Significant Accounting Policies (Details) - USD ($) $ / shares in Units, $ in Millions	Mar. 31, 2016	Jun. 30, 2015	Jan. 08, 2015
Jointly Owned Utility Plant Interests [Line Items]
Royal Gold initial investment			$ 5
Contango's percentage of interest in Joint Venture Company			100.00%
Common stock, shares authorized	30,000,000	30,000,000
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares issued	3,958,540	3,876,206
Common stock, shares outstanding	3,958,540	3,876,206

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Royal Gold initial investment

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Face amount or stated value per share of common stock.

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