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Commitments And Contingencies (Narrative) (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 $ / bbl | May. 31, 2017 USD ($) | May. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) item | May. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Rent expense |  |  |  | $ 49,000 |  | $ 73,000 | $ 92,000
Production costs and taxes |  |  |  | 4,224,000 |  | 5,994,000 | $ 5,524,000
Compensation reduction until WTI posting | $ / bbl | 70 |  |  |  |  |  |
Compensation reimbursement at WTI posting | $ / bbl | 85 |  |  |  |  |  |
Decrease in compensation |  |  |  | $ 142,000 |  |  |
Incidence Of Non-Compliance [Member] |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Wells issued incidence of non-compliance | item |  |  |  | 1 |  |  |
Maximum range of possible payment |  |  |  | $ 386,000 |  |  |
Production costs and taxes |  |  |  |  |  | $ 386,000 |
Denver Colorado [Member] |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Lease term |  |  |  | 38 months |  |  |
Number of free months in lease |  |  |  | 2 months |  |  |
Leases rent due per month |  | $ 4,216.81 | $ 4,090.94 | $ 2,700 | $ 3,965.06 |  |
Lease due in 2016 |  |  |  | 50,000 |  |  |
Lease due in 2017 |  |  |  | $ 21,000 |  |  |

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- Definition Cost incurred related to the upstream oil and gas activities, such as the exploration, development, and production of crude petroleum and natural gas and all taxes not related to income of the entity or excise or sales taxes levied on the revenue of the entity that are not reported elsewhere. These taxes could include production, real estate, personal property, and pump tax. + References No definition available. + Details
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