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Note 19 - Quarterly Financial Data (Unaudited) | 12 Months Ended
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Dec. 31, 2019
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 2019 and 2018:
201 9 Quarters (In thousands, except per share amounts) |  | First |  |  | Second |  |  | Third |  |  | Fourth |
Operating revenue |  | $ | 199,023 |  |  | $ | 212,090 |  |  | $ | 214,973 |  |  | $ | 217,185 |
Operating income |  |  | 17,733 |  |  |  | 19,944 |  |  |  | 20,034 |  |  |  | 18,787 |
Net income |  |  | 13,546 |  |  |  | 15,190 |  |  |  | 16,587 |  |  |  | 15,748 |
Basic earnings per common share |  |  | 0.25 |  |  |  | 0.28 |  |  |  | 0.30 |  |  |  | 0.29 |
Diluted earnings per common share |  |  | 0.25 |  |  |  | 0.28 |  |  |  | 0.30 |  |  |  | 0.29 |
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 |
The sum of the diluted earnings per common share for the 2019 and 2018 quarters exceeds the amounts for each 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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