Note 19 - Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

Quarterly Financial Information [Table Text Block]

2019 Quarters (In thousands, except per share amounts)	First		Second		Third		Fourth
Operating revenue	$	199,023	$	212,090	$	214,973	$	217,185
Operating income		17,733		19,944		20,034		18,787
Net income		13,546		15,190		16,587		15,748
Basic earnings per common share		0.25		0.28		0.30		0.29
Diluted earnings per common share		0.25		0.28		0.30		0.29

2018 Quarters (In thousands, except per share amounts)	First		Second		Third		Fourth
Operating revenue	$	186,960	$	197,024	$	199,649	$	203,961
Operating income		13,594		18,223		18,993		19,538
Net income		10,331		13,702		15,257		15,737
Basic earnings per common share		0.19		0.25		0.28		0.29
Diluted earnings per common share		0.19		0.25		0.28		0.29