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Note 20 - Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2020
Notes Tables |
Quarterly Financial Information [Table Text Block] |
2020 Quarters (In thousands, except per share amounts) |  | First |  |  | Second |  |  | Third |  |  | Fourth |
Operating revenue |  | $ | 218,646 |  |  | $ | 212,384 |  |  | $ | 216,011 |  |  | $ | 227,333 |
Operating income |  |  | 18,032 |  |  |  | 25,256 |  |  |  | 24,400 |  |  |  | 25,558 |
Net income |  |  | 13,718 |  |  |  | 18,134 |  |  |  | 18,044 |  |  |  | 19,604 |
Basic earnings per common share |  |  | 0.17 |  |  |  | 0.22 |  |  |  | 0.22 |  |  |  | 0.24 |
Diluted earnings per common share |  |  | 0.17 |  |  |  | 0.22 |  |  |  | 0.22 |  |  |  | 0.24 |
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 |  |  | 0.17 |  |  |  | 0.19 |  |  |  | 0.20 |  |  |  | 0.19 |
Diluted earnings per common share |  |  | 0.16 |  |  |  | 0.18 |  |  |  | 0.20 |  |  |  | 0.19 |

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121640914&loc=d3e1280-108306 + Details
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