Note 2 - Significant Accounting Policies and Methods of Application (Details) - Estimated Useful Lives of Assets	12 Months Ended
	Dec. 31, 2014
Gas, Transmission and Distribution Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Property, Estimated Useful Life	5 years
Gas, Transmission and Distribution Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Property, Estimated Useful Life	10 years
Wells and Related Equipment and Facilities [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Property, Estimated Useful Life	40 years
Wells and Related Equipment and Facilities [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Property, Estimated Useful Life	60 years
Property, Plant and Equipment, Other Types [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Property, Estimated Useful Life	40 years