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Note 18 - Quarterly Financial Data (Unaudited) | 12 Months Ended
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Dec. 31, 2017
Notes to Financial Statements |
Quarterly Financial Information [Text Block] | 1 8 . Quarterly Financial Data (Unaudited) The following is a summary of the quarterly results of operations for 2017 and 2016:
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 |
Di luted earnings per common share – excluding deferred income taxes benefit (1) |  |  | 0.15 |  |  |  | 0.17 |  |  |  | 0.14 |  |  |  | 0.16 |
201 6 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 |  |  | 0.15 |  |  |  | 0.16 |  |  |  | 0.16 |  |  |  | 0.15 |
Diluted earnings per common share |  |  | 0.15 |  |  |  | 0.16 |  |  |  | 0.15 |  |  |  | 0.15 |
( 1 ) | The amounts are presented for comparative purposes excluding the $56.5 million deferred income taxes benefit recorded to recognize the impact of the reduction of the federal corporate statutory income tax rate beginning on January 1, 2018 from 35% to 21% related to the Tax Cuts and Jobs Act of 2017 .
The sum of the basic and diluted earnings per common share for the 2017 quarters is less than the amounts for the year 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 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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