Note 16 - Quarterly Financial Data (Unaudited)

12 Months Ended

Dec. 31, 2014

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Information [Text Block]

16. Quarterly Financial Data (Unaudited)

The following is a summary of the quarterly results of operations for 2014 and 2013:

2014 Quarters (In thousands, except per share amounts)	First		Second		Third		Fourth
Operating revenue	$	159,409	$	168,423	$	171,550	$	173,547
Operating income		8,640		12,932		13,042		16,392
Net income		5,287		7,926		7,652		8,969
Basic earnings per common share		0.16		0.24		0.23		0.27
Diluted earnings per common share		0.16		0.24		0.23		0.27

2013 Quarters (In thousands, except per share amounts)	First		Second		Third		Fourth
Operating revenue	$	164,474	$	161,413	$	167,103	$	166,224
Operating income		12,538		13,121		13,653		12,683
Net income		7,202		7,667		7,977		7,301
Basic earnings per common share		0.22		0.23		0.24		0.22
Diluted earnings per common share		0.22		0.23		0.24		0.22

The sum of the basic and diluted earnings per common share for the 2014 quarters exceeds the basic and diluted earnings per common share for 2014, and the sum of the diluted earnings per common share for the 2013 quarters exceeds the diluted earnings per common share for 2013, due to differences in rounding.