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5. Property and Equipment (Tables)
 9 Months Ended
Sep. 30, 2015
Property and equipment:  
Property and equipment
  September 30,   December 31, 
   2015   2014 
Oil and gas properties, full cost method:          
Evaluated costs  $128,083,460   $112,418,105 
Unevaluated costs, not subject to amortization or ceiling test   803,718    591,121 
    128,887,178    113,009,226 
Other property and equipment   139,004    139,004 
    129,026,182    113,148,230 
Less: Accumulated depreciation, amortization, depletion and impairments   (78,895,166)   (18,902,524)
Total property and equipment, net  $50,131,016   $94,245,706 

 
Depreciation, depletion, and amortization expense
   Nine Months Ended 
   September 30, 
   2015   2014 
Depletion of costs for evaluated oil and gas properties  $7,346,356   $5,994,180 
Depreciation and amortization of other property and equipment   12,286    24,327 
Total depreciation, amortization and depletion  $7,358,642   $6,018,507