5. COMMODITY DERIVATIVE INSTRUMENTS (Details 3) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Balance, beginning of period, before tax	$ 0	$ 63,091
Balance, beginning of period, after tax	0	38,801
Sale of unexpired contracts previously subject to hedge accounting rules before tax	0	(119,917)
Sale of unexpired contracts previously subject to hedge accounting rules after tax	0	(73,749)
Other reclassifications due to expired contracts previously subject to hedge accounting rules, before tax	0	56,826
Other reclassifications due to expired contracts previously subject to hedge accounting rules, after tax	0	34,948
Balance, end of period, before tax	0	0
Balance, end of period, after tax	$ 0	$ 0