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Note 16 - Quarterly Financial Data (Unaudited) | 12 Months Ended
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Dec. 31, 2016
Notes to Financial Statements |
Quarterly Financial Information [Text Block] | 16 . Quarterly Financial Data (Unaudited) The following is a summary of the quarterly results of operations for 2016 and 2015:
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 |
The sum of the basic earnings per common share for the 2015 and 2016 quarters is less than the basic earnings per common share for each of 2015 and 2016 due to differences in rounding.

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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=68076893&loc=d3e1570-108306 Reference 2: 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=68064558&loc=d3e765-108305 Reference 3: 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=68064558&loc=d3e725-108305 + Details
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