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Regulatory Assets and Liabilities - Schedule Of Regulatory Assets And Liabilities (Detail) - USD ($)
Sep. 30, 2015
Dec. 31, 2014
REGULATORY ASSETS    
Regulatory Assets, Current $ 2,713,255 $ 4,097,822
Regulatory Assets, Noncurrent 1,653,750 2,055,404
REGULATORY LIABILITIES    
Regulatory Liability, Current 1,065,596 925,175
Regulatory Liability, Noncurrent 1,210,816 1,089,850
Recoverable cost of gas purchases [Member]    
REGULATORY ASSETS    
Regulatory Assets, Current 2,179,935 692,117
Regulatory Assets, Noncurrent 0 0
Deferred costs [Member]    
REGULATORY ASSETS    
Regulatory Assets, Current 489,996 489,996
Regulatory Assets, Noncurrent 1,347,509 1,715,006
Deferred loss on commodity swaps [Member]    
REGULATORY ASSETS    
Regulatory Assets, Current 0 2,872,385
Regulatory Assets, Noncurrent 0 0
Income taxes [Member]    
REGULATORY ASSETS    
Regulatory Assets, Current 0 0
Regulatory Assets, Noncurrent 296,819 296,819
REGULATORY LIABILITIES    
Regulatory Liability, Current 0 0
Regulatory Liability, Noncurrent 83,161 83,161
Rate case costs [Member]    
REGULATORY ASSETS    
Regulatory Assets, Current 43,324 43,324
Regulatory Assets, Noncurrent 9,422 43,579
Over-recovered gas purchases [Member]    
REGULATORY LIABILITIES    
Regulatory Liability, Current 1,065,596 925,175
Regulatory Liability, Noncurrent 0 0
Asset retirement costs [Member]    
REGULATORY LIABILITIES    
Regulatory Liability, Current 0 0
Regulatory Liability, Noncurrent $ 1,127,655 $ 1,006,689