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Note 13 - Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

Property, Plant and Equipment [Table Text Block]

(in thousands)		December 31, 2019				December 31, 2018
Electric Plant in Service
Production		$	915,996			$	905,224
Transmission			647,474				512,832
Distribution			526,146				502,261
General			123,268				99,404
Electric Plant in Service			2,212,884				2,019,721
Construction Work in Progress			177,584				170,090
Total Gross Electric Plant			2,390,468				2,189,811
Less Accumulated Depreciation and Amortization			731,110				699,642
Net Electric Plant		$	1,659,358			$	1,490,169
Nonelectric Operations Plant
Equipment		$	187,904			$	170,634
Buildings and Leasehold Improvements			53,412				53,011
Land			6,040				4,475
Nonelectric Operations Plant			247,356				228,120
Construction Work in Progress			7,654				11,536
Total Gross Nonelectric Plant			255,010				239,656
Less Accumulated Depreciation and Amortization			160,574				148,727
Net Nonelectric Operations Plant		$	94,436			$	90,929
Net Plant		$	1,753,794			$	1,581,098

Schedule of Useful Lives for Property, Plant Equipment [Table Text Block]

		Service Life Range
(years)		Low			High
Electric Fixed Assets:
Production Plant		9			82
Transmission Plant		51			75
Distribution Plant		15			70
General Plant		5			57
Nonelectric Fixed Assets:
Equipment		2			12
Buildings and Leasehold Improvements		5			40