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Quarterly Operating Results - Unaudited (Tables)

12 Months Ended

Dec. 31, 2016

Quarterly Financial Information Disclosure [Abstract]

Quarterly financial information

		(Thousands of Dollars, Except per Share Data)
2016		1^st				2^nd				3^rd				4^th				Total

Operating Revenues		$	30,579			$	32,725			$	37,754			$	31,808			$	132,906
Operating Income			8,302				10,328				14,156				7,846				40,632
Net Income			4,790				5,919				8,813				3,220				22,742
Basic Earnings per Share		$	0.29			$	0.36			$	0.54			$	0.20			$	1.39
Diluted Earnings per Share		$	0.29			$	0.36			$	0.54			$	0.19			$	1.38

2015		1^st				2^nd				3^rd				4^th				Total

Operating Revenues		$	28,780			$	31,666			$	34,654			$	30,925			$	126,025
Operating Income			6,685				9,235				11,460				8,460				35,840
Net Income			3,636				5,089				6,743				4,560				20,028
Basic Earnings per Share		$	0.22			$	0.31			$	0.41			$	0.29			$	1.23
Diluted Earnings per Share		$	0.22			$	0.31			$	0.41			$	0.28			$	1.22