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Note 19 - Quarterly Financial Data (Unaudited) | 12 Months Ended
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Dec. 31, 2018
Notes to Financial Statements |
Quarterly Financial Information [Text Block] | 1 9 . Quarterly Financial Data (Unaudited) The following is a summary of the quarterly results of operations for 2018 and 2017:
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 |
( 1 ) | The amounts are presented for comparative purposes excluding the $56.5 million deferred income taxes benefit recorded to recognize the impact on our federal net deferred tax liability of the reduction of the federal corporate statutory income tax rate from 35% to 21% related to the Tax Cuts and Jobs Act of 2017.
The sum of the diluted earnings per common share for the 2018 quarters exceeds the amount for the year, and 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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