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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
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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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- Definition Face amount or stated value per share of common stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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