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Regulatory matters and revenues subject to refund (Details) (USD $)
In Millions, unless otherwise specified
 0 Months Ended
Feb. 27, 2014
NDPSC [Member]
Nov. 17, 2013
NDPSC [Member]
Sep. 18, 2013
NDPSC [Member]
Oct. 31, 2013
FERC [Member]
Regulatory matters and revenues subject to refund [Line Items]        
Rate increase requested $ 7.4   $ 6.8  
Percent above current rates requested 4.60%   6.40%  
Interim rate increase (decrease), amount   4.3    
Interim rate increase, percent   4.00%    
Rate change application annual increase, amount       28.9
Increased expenditures covered by change application       $ 312