Note 14 - Quarterly Financial Data (Unaudited)

12 Months Ended

Dec. 31, 2012

Quarterly Financial Information [Text Block]

14.  Quarterly Financial Data (Unaudited)

The following is a summary of the quarterly results of operations for 2012 and 2011:

2012 Quarters (In thousands, except per share amounts)	First		Second		Third		Fourth
Operating revenue	$	151,474	$	156,964	$	163,606	$	166,412
Operating income		9,519		13,283		9,840		13,211
Net income		5,446		7,584		6,518		7,719
Basic earnings per common share		0.25		0.34		0.30		0.35
Diluted earnings per common share		0.25		0.34		0.29		0.35

2011 Quarters (In thousands, except per share amounts)	First		Second		Third		Fourth
Operating revenue	$	137,856	$	151,135	$	156,348	$	158,340
Operating income		7,609		11,359		11,111		12,951
Net income		4,095		6,194		6,333		7,663
Basic earnings per common share		0.19		0.28		0.29		0.35
Diluted earnings per common share		0.19		0.28		0.29		0.35

              The sum of each of the basic and diluted earnings per common share for the 2011 quarters exceeds each of the basic and diluted earnings per common share for 2011, due to differences in rounding.