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Note 19 - Quarterly Financial Data (Unaudited) - Quarterly Results of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Operating revenue |  | $ 203,961 | $ 199,649 | $ 197,024 | $ 186,960 | $ 182,771 | $ 170,679 | $ 171,511 | $ 173,159 | $ 787,594 | $ 698,120 | $ 671,144
Operating income |  | 19,538 | 18,993 | 18,223 | 13,594 | 14,333 | 13,022 | 15,569 | 13,938 | 70,348 | 56,862 | 58,303
Net income |  | $ 15,737 | $ 15,257 | $ 13,702 | $ 10,331 | $ 65,074 | $ 7,855 | $ 9,141 | $ 8,214 | $ 55,027 | $ 90,284 | $ 33,464
Basic earnings per common share (in dollars per share) |  | $ 0.29 | $ 0.28 | $ 0.25 | $ 0.19 | $ 1.19 | $ 0.14 | $ 0.17 | $ 0.15 | $ 1.01 | $ 1.66 | $ 0.62
Diluted earnings per common share (in dollars per share) |  | $ 0.29 | $ 0.28 | $ 0.25 | $ 0.19 | $ 1.18 | $ 0.14 | $ 0.17 | $ 0.15 | $ 1 | $ 1.65 | $ 0.61
Net income – excluding deferred income taxes benefit(1) | [1] |  |  |  |  | $ 8,609 | $ 7,855 | $ 9,141 | $ 8,214 |  |  |
Basic earnings per common share – excluding deferred income taxes benefit(1) (in dollars per share) | [1] |  |  |  |  | $ 0.16 | $ 0.14 | $ 0.17 | $ 0.15 |  |  |
Diluted earnings per common share – excluding deferred income taxes benefit(1) (in dollars per share) | [1] |  |  |  |  | $ 0.16 | $ 0.14 | $ 0.17 | $ 0.15 |  |  |
[1] | The amounts are presented for comparative purposes excluding the $56.5 million deferred income taxes benefit recorded to recognize the impact on our federal net deferred tax liability of the reduction of the federal corporate statutory income tax rate from 35% to 21% related to the Tax Cuts and Jobs Act of 2017.

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