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Note 18 - Quarterly Financial Data (Unaudited) - Quarterly Results of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating revenue |  | $ 182,771 | $ 170,679 | $ 171,511 | $ 173,159 | $ 172,661 | $ 170,464 | $ 166,090 | $ 161,929 | $ 698,120 | $ 671,144 | $ 664,994
Operating income |  | 14,333 | 13,022 | 15,569 | 13,938 | 14,533 | 14,869 | 14,776 | 14,125 | 56,862 | 58,303 | 61,063
Net income |  | 65,074 | 7,855 | 9,141 | 8,214 | $ 8,303 | $ 8,437 | $ 8,531 | $ 8,193 | $ 90,284 | $ 33,464 | $ 35,745
Net income – excluding deferred income taxes benefit(1) | [1] | $ 8,609 | $ 7,855 | $ 9,141 | $ 8,214 |  |  |  |  |  |  |
Basic earnings per common share (in dollars per share) |  | $ 1.19 | $ 0.14 | $ 0.17 | $ 0.15 | $ 0.15 | $ 0.16 | $ 0.16 | $ 0.15 | $ 1.66 | $ 0.62 | $ 0.64
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 (in dollars per share) |  | 1.18 | 0.14 | 0.17 | 0.15 | $ 0.15 | $ 0.15 | $ 0.16 | $ 0.15 | $ 1.65 | $ 0.61 | $ 0.64
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 of the reduction of the federal corporate statutory income tax rate beginning on January 1, 2018 from 35% to 21% related to the Tax Cuts and Jobs Act of 2017.

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