Income Taxes - Summary of Significant Components of Deferred Tax Assets and Liabilities (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Deferred tax assets:
Allowance for doubtful accounts (Current)	$ 141,701	$ 724,534
Contributions in aid of construction (Current)	0	0
Other nondeductible accruals (Current)	46,102	47,484
Recoverable purchase gas costs (Current)	217,349	60,903
Net operating loss carryforwards (Current)	0	0
Property tax (Current)	157,683	154,146
Other (Current)	451,213	754,235
Total deferrred tax assets (Current)	1,014,048	1,741,302
Allowance for doubtful accounts (non current)	0	0
Contributions in aid of construction (non current)	2,480,637	1,652,760
Other nondeductible accruals (non current)	0	0
Recoverable purchase gas costs (non current)	0	0
Net operating loss carryforwards (non current)	13,255,842	7,733,763
Property tax (non current)	0	0
Other (non current)	0	0
Total deferred tax assets (non current)	15,736,479	9,386,523
Deferred tax liabilities:
Recoverable purchase gas costs (Current)	378,853	454,795
Property, plant and equipment (Current)	0	0
Unrealized gain on securities available for sale (Current)	0	61,475
Amortization of intangibles (Current)	0	0
Other (Current)	0	0
Total deferrred tax liabilities	378,853	516,270
Net deferred tax asset (liability) before valuation allowance (Current)	635,195	1,225,032
Less: valuation allowance (Current)	0	0
Total deferred tax asset (liability)	635,195	1,225,032
Discontinued operations	0	0
Net deferred tax asset (liability), continuing operations	635,195	1,225,032
Recoverable purchase gas costs (non current)	0	0
Property, plant and equipment (non current)	17,375,812	11,402,464
Unrealized gain on securities available for sale (non current)	549,046	0
Amortization of intangibles (non current)	738,608	539,498
Other (non current)	1,114,692	800,698
Total deferred tax liabilities (non current)	19,778,158	12,742,660
Net deferred tax asset (liability) before valuation allowance (non current)	(4,041,679)	(3,356,137)
Less: valuation allowance (non current)	(6,496,715)	(5,699,029)
Total deferred tax asset (liability)	(10,538,394)	(9,055,166)
Discontinued operations	0	0
Net deferred tax asset (liability), continuing operations	$ (10,538,394)	$ (9,055,166)