Commitments and Contingencies - Additional Information (Detail) (USD $)	0 Months Ended	3 Months Ended		12 Months Ended	3 Months Ended		3 Months Ended		0 Months Ended	3 Months Ended		12 Months Ended			3 Months Ended
	Feb. 25, 2013	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2013 Minimum [Member]	Mar. 31, 2014 Minimum [Member]	Dec. 31, 2013 Maximum [Member]	Mar. 31, 2014 Maximum [Member]	Dec. 10, 2013 Shareholders Suit [Member]	Mar. 31, 2014 Shareholders Suit [Member]	Mar. 31, 2014 NEO [Member]	Dec. 31, 2013 NEO [Member]	Dec. 31, 2010 NEO [Member]	Jun. 30, 2013 NEO [Member]	Mar. 31, 2014 Orwell [Member]	Jun. 30, 2013 Orwell [Member]
Commitments Contingencies And Litigation [Line Items]
Insurance premium paid before any losses covered										$ 250,000
Number of individuals filing suit									5
Number of claims pending									5
Minimum period of relief for economic loss	4 years
Over (under) recovered gas costs		7,729,264	2,276,426										1,100,000
Unrecovered costs for purchased gas amount for audit adjustment											84,463	234,253
Liability of customers						1,500,000		1,900,000						943,550		251,081
Valuation adjustments											800,000				200,000
Increase in initial estimated liability					300,000		1,500,000
Accounts receivable trade from large industrial customer under chapter 11 bankruptcy protection		1,079,342		1,059,224
Allowance for doubtful accounts receivable for large industrial customer covered under bankruptcy protection act		1,421,000		1,421,000
Accounts receivable from customer under bankruptcy protection		$ 178,546