DERIVATIVE FINANCIAL INSTRUMENTS (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2017 USD ($) MMBTU	Dec. 31, 2016 MMBTU
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	71,662,797	83,904,223
Gas Distribution
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	6,500,000	4,510,000
Gas Marketing segment [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	65,162,797	79,394,223
Commodity Contract
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	16,634,000	16,457,000
Commodity Contract | Gas Distribution
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	6,500,000	4,510,000
Commodity Contract | Gas Marketing segment [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	10,134,000	11,947,000
Energy Related Derivative [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	55,028,797	67,447,223
Energy Related Derivative [Member] | Gas Marketing segment [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	55,028,797	67,447,223
Energy Related Derivative [Member] | Basis Swap [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Energy Measure	9,630,864	730,721