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9. Derivative Instruments (Details-Balance sheet derivatives) - USD ($)
Sep. 30, 2015
Dec. 31, 2014
Commodity derivative assets $ 2,693,561 $ 7,579,745
Commodity derivative liabilities 0 0
Gross amounts recognized    
Commodity derivative assets 2,694,001 7,620,896
Commodity derivative liabilities 0 0
Gross amounts offset on balance sheet    
Commodity derivative assets (440) (41,151)
Commodity derivative liabilities $ 0 $ 0