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Note 18 - Quarterly Results of Operations (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2014

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information [Table Text Block]

		2014
		Three Months Ended
		March 31				June 30				September 30				December 31
		(in thousands, except per share data)

Operating revenues		$	97,820			$	104,343			$	107,059			$	101,715
Operating expenses and costs			94,975				95,754				98,609				98,589

Operating income			2,845				8,589				8,450				3,126
Non-operating income			272				259				594				974
Interest expense			862				743				632				660
Income tax expense			898				3,160				3,355				1,308

Net income		$	1,357			$	4,945			$	5,057			$	2,132

Net income per common share:
Basic		$	0.17			$	0.62			$	0.63			$	0.27
Diluted		$	0.17			$	0.62			$	0.63			$	0.27

Average common shares outstanding:
Basic			7,985				7,992				7,993				7,988
Diluted			8,033				8,035				8,032				8,027

		2013
		Three Months Ended
		March 31				June 30				September 30				December 31
		(in thousands, except per share data)

Operating revenues		$	99,982			$	104,408			$	101,878			$	96,545
Operating expenses and costs			100,234				99,402				97,194				94,477

Operating income (loss)			(252	)			5,006				4,684				2,068
Non-operating income			283				289				130				838
Interest expense			815				880				846				834
Income tax expense (benefit)			(328	)			1,733				1,575				776

Net income (loss)		$	(456	)		$	2,682			$	2,393			$	1,296

Net income (loss) per common share:
Basic		$	(0.05	)		$	0.31			$	0.28			$	0.15
Diluted		$	(0.05	)		$	0.31			$	0.28			$	0.15

Average common shares outstanding:
Basic			8,688				8,658				8,654				8,649
Diluted			8,688				8,659				8,663				8,683