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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