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Note 16 - Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2016
Notes Tables |
Quarterly Financial Information [Table Text Block] |
20 16 Quarters (In thousands, except per share amounts) |  | First |  |  | Second |  |  | Third |  |  | Fourth |
Operating revenue |  | $ | 161,929 |  |  | $ | 166,090 |  |  | $ | 170,464 |  |  | $ | 172,661 |
Operating income |  |  | 14,125 |  |  |  | 14,776 |  |  |  | 14,869 |  |  |  | 14,533 |
Net income |  |  | 8,193 |  |  |  | 8,531 |  |  |  | 8,437 |  |  |  | 8,303 |
Basic earnings per common share |  |  | 0.25 |  |  |  | 0.26 |  |  |  | 0.26 |  |  |  | 0.25 |
Diluted earnings per common share |  |  | 0.25 |  |  |  | 0.26 |  |  |  | 0.26 |  |  |  | 0.25 |
2015 Quarters ( In thousands, except per share amounts) |  | First |  |  | Second |  |  | Third |  |  | Fourth |
Operating revenue |  | $ | 161,287 |  |  | $ | 163,588 |  |  | $ | 171,346 |  |  | $ | 168,773 |
Operating income |  |  | 17,311 |  |  |  | 14,161 |  |  |  | 14,354 |  |  |  | 15,237 |
Net income |  |  | 10,188 |  |  |  | 8,357 |  |  |  | 8,410 |  |  |  | 8,790 |
Basic earnings per common share |  |  | 0.30 |  |  |  | 0.25 |  |  |  | 0.25 |  |  |  | 0.26 |
Diluted earnings per common share |  |  | 0.30 |  |  |  | 0.25 |  |  |  | 0.25 |  |  |  | 0.26 |

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=68076893&loc=d3e1280-108306 + Details
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