DERIVATIVE FINANCIAL INSTRUMENTS (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2016 USD ($) MMBTU	Dec. 31, 2015 MMBTU
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	51,102,704	58,229,980
Gas Distribution
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	9,240,000	7,530,000
Retail Gas Marketing
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	6,236,000	7,869,000
Energy Marketing [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	35,626,704	42,830,980
Commodity Contract
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	20,108,500	19,372,500
Commodity Contract | Gas Distribution
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	9,240,000	7,530,000
Commodity Contract | Retail Gas Marketing
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	6,236,000	7,869,000
Commodity Contract | Energy Marketing [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	4,632,500	3,973,500
Energy Related Derivative [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	30,994,204	38,857,480
Energy Related Derivative [Member] | Energy Marketing [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	30,994,204	38,857,480
Energy Related Derivative [Member] | Basis Swap [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Energy Measure	1,679,289	1,842,048