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v3.20.4

Note 20 - Quarterly Financial Data (Unaudited) - Quarterly Results of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Operating revenue | $ 227,333 | $ 216,011 | $ 212,384 | $ 218,646 | $ 217,185 | $ 214,973 | $ 212,090 | $ 199,023 | $ 874,374 | $ 843,271 | $ 787,594
Operating income | 25,558 | 24,400 | 25,256 | 18,032 | 18,787 | 20,034 | 19,944 | 17,733 | 93,246 | 76,498 | 70,348
Net income | $ 19,604 | $ 18,044 | $ 18,134 | $ 13,718 | $ 15,748 | $ 16,587 | $ 15,190 | $ 13,546 | $ 69,500 | $ 61,071 | $ 55,027
Basic earnings per common share (in dollars per share) | $ 0.24 | $ 0.22 | $ 0.22 | $ 0.17 | $ 0.19 | $ 0.20 | $ 0.19 | $ 0.17 | $ 0.84 | $ 0.75 | $ 0.67
Diluted earnings per common share (in dollars per share) | $ 0.24 | $ 0.22 | $ 0.22 | $ 0.17 | $ 0.19 | $ 0.20 | $ 0.18 | $ 0.16 | $ 0.84 | $ 0.74 | $ 0.67

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