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Note 16 - Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2016

Notes Tables

Quarterly Financial Information [Table Text Block]

20 16 Quarters (In thousands, except per share amounts)		First				Second				Third				Fourth
Operating revenue		$	161,929			$	166,090			$	170,464			$	172,661
Operating income			14,125				14,776				14,869				14,533
Net income			8,193				8,531				8,437				8,303
Basic earnings per common share			0.25				0.26				0.26				0.25
Diluted earnings per common share			0.25				0.26				0.26				0.25

2015 Quarters ( In thousands, except per share amounts)		First				Second				Third				Fourth
Operating revenue		$	161,287			$	163,588			$	171,346			$	168,773
Operating income			17,311				14,161				14,354				15,237
Net income			10,188				8,357				8,410				8,790
Basic earnings per common share			0.30				0.25				0.25				0.26
Diluted earnings per common share			0.30				0.25				0.25				0.26

X

- Definition

Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)-(j)
-URI http://asc.fasb.org/extlink&oid=68076893&loc=d3e1280-108306

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X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Period Type:	duration