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Note 19 - Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2018
Notes Tables |
Quarterly Financial Information [Table Text Block] |
201 8 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 |
201 7 Quarters (In thousands, except per share amounts) |  | First |  |  | Second |  |  | Third |  |  | Fourth |
Operating revenue |  | $ | 173,159 |  |  | $ | 171,511 |  |  | $ | 170,679 |  |  | $ | 182,771 |
Operating income |  |  | 13,938 |  |  |  | 15,569 |  |  |  | 13,022 |  |  |  | 14,333 |
Net income |  |  | 8,214 |  |  |  | 9,141 |  |  |  | 7,855 |  |  |  | 65,074 |
Net income – excluding deferred income taxes benefit (1) |  |  | 8,214 |  |  |  | 9,141 |  |  |  | 7,855 |  |  |  | 8,609 |
Basic earnings per common share |  |  | 0.15 |  |  |  | 0.17 |  |  |  | 0.14 |  |  |  | 1.19 |
Basic earnings per common share – excluding deferred income taxes benefit (1) |  |  | 0.15 |  |  |  | 0.17 |  |  |  | 0.14 |  |  |  | 0.16 |
Diluted earnings per common share |  |  | 0.15 |  |  |  | 0.17 |  |  |  | 0.14 |  |  |  | 1.18 |
Diluted earnings per common share – excluding deferred income taxes benefit (1) |  |  | 0.15 |  |  |  | 0.17 |  |  |  | 0.14 |  |  |  | 0.16 |

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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=109225645&loc=d3e1280-108306 + Details
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