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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
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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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