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Note 20 - Quarterly Financial Data (Unaudited) | 12 Months Ended
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Dec. 31, 2020
Notes to Financial Statements |
Quarterly Financial Information [Text Block] | 20. Quarterly Financial Data (Unaudited) The following is a summary of the quarterly results of operations for 2020 and 2019:
2020 Quarters (In thousands, except per share amounts) |  | First |  |  | Second |  |  | Third |  |  | Fourth |
Operating revenue |  | $ | 218,646 |  |  | $ | 212,384 |  |  | $ | 216,011 |  |  | $ | 227,333 |
Operating income |  |  | 18,032 |  |  |  | 25,256 |  |  |  | 24,400 |  |  |  | 25,558 |
Net income |  |  | 13,718 |  |  |  | 18,134 |  |  |  | 18,044 |  |  |  | 19,604 |
Basic earnings per common share |  |  | 0.17 |  |  |  | 0.22 |  |  |  | 0.22 |  |  |  | 0.24 |
Diluted earnings per common share |  |  | 0.17 |  |  |  | 0.22 |  |  |  | 0.22 |  |  |  | 0.24 |
2019 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 |  |  | 0.17 |  |  |  | 0.19 |  |  |  | 0.20 |  |  |  | 0.19 |
Diluted earnings per common share |  |  | 0.16 |  |  |  | 0.18 |  |  |  | 0.20 |  |  |  | 0.19 |
The sum of the basic and diluted earnings per common share for the 2020 quarters exceeds the amount for the year, and the sum of the diluted earnings per common share for the 2019 quarters is less than the amount 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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