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Quarterly Operating Results - Unaudited (Tables)

12 Months Ended

Dec. 31, 2012

Quarterly Financial Information Disclosure [Abstract]

Quarterly financial information

		(Thousands of Dollars, Except per Share Data)
2012		1^st				2^nd				3^rd				4^th				Total

Operating Revenues		$	23,546			$	27,401			$	32,353			$	27,079			$	110,379
Operating Income			3,877				7,210				10,843				5,717				27,647
Net Income			1,807				3,725				6,138				2,726				14,396
Basic Earnings per Share		$	0.11			$	0.23			$	0.39			$	0.17			$	0.90
Diluted Earnings per Share		$	0.11			$	0.23			$	0.39			$	0.17			$	0.90

2011		1^st				2^nd				3^rd				4^th				Total

Operating Revenues		$	23,996			$	26,102			$	28,671			$	23,300			$	102,069
Operating Income			4,768				6,738				8,516				4,179				24,201
Net Income			2,630				3,625				5,143				2,049				13,447
Basic Earnings per Share		$	0.17			$	0.23			$	0.33			$	0.12			$	0.85
Diluted Earnings per Share		$	0.17			$	0.23			$	0.32			$	0.12			$	0.84