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Note 16 - Quarterly Financial Data (Unaudited) | 12 Months Ended
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Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Financial Information [Text Block] | 16. Quarterly Financial Data (Unaudited) The following is a summary of the quarterly results of operations for 2014 and 2013:
20 14 Quarters (In thousands, except per share amounts) |  | First |  |  | Second |  |  | Third |  |  | Fourth |
Operating revenue |  | $ | 159,409 |  |  | $ | 168,423 |  |  | $ | 171,550 |  |  | $ | 173,547 |
Operating income |  |  | 8,640 |  |  |  | 12,932 |  |  |  | 13,042 |  |  |  | 16,392 |
Net income |  |  | 5,287 |  |  |  | 7,926 |  |  |  | 7,652 |  |  |  | 8,969 |
Basic earnings per common share |  |  | 0.16 |  |  |  | 0.24 |  |  |  | 0.23 |  |  |  | 0.27 |
Diluted earnings per common share |  |  | 0.16 |  |  |  | 0.24 |  |  |  | 0.23 |  |  |  | 0.27 |
2013 Quarters (In thousands, except per share amounts) |  | First |  |  | Second |  |  | Third |  |  | Fourth |
Operating revenue |  | $ | 164,474 |  |  | $ | 161,413 |  |  | $ | 167,103 |  |  | $ | 166,224 |
Operating income |  |  | 12,538 |  |  |  | 13,121 |  |  |  | 13,653 |  |  |  | 12,683 |
Net income |  |  | 7,202 |  |  |  | 7,667 |  |  |  | 7,977 |  |  |  | 7,301 |
Basic earnings per common share |  |  | 0.22 |  |  |  | 0.23 |  |  |  | 0.24 |  |  |  | 0.22 |
Diluted earnings per common share |  |  | 0.22 |  |  |  | 0.23 |  |  |  | 0.24 |  |  |  | 0.22 |
The sum of the basic and diluted earnings per common share for the 2014 quarters exceeds the basic and diluted earnings per common share for 2014, and the sum of the diluted earnings per common share for the 2013 quarters exceeds the diluted earnings per common share for 2013, due to differences in rounding.

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- Definition The entire disclosure for the quarterly financial data in the annual financial statements. The disclosure may include a tabular presentation of financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income or loss before extraordinary items and earnings per share data. It also includes an indication if the information in the note is unaudited, comments on the aggregate effect of year-end adjustments, and an explanation of matters or transactions that affect comparability or are pertinent to an understanding of the information furnished. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6372559&loc=d3e765-108305 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6372559&loc=d3e725-108305 Reference 3: 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=35737889&loc=d3e1280-108306 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section G -Subsection 1 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 302 -Paragraph a + Details
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