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Note 5 - Common Shares and Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2019
Notes Tables |
Schedule of Common Stock Outstanding Roll Forward [Table Text Block] |
Common Shares Outstanding, December 31, 2018 |  |  | 39,664,884 |
Issuances: |  |  |  |
At-the-Market Offering |  |  | 347,000 |
Executive Stock Performance Awards (2016 awards earned) |  |  | 102,198 |
Automatic Dividend Reinvestment and Share Purchase Plan: |  |  |  |
Dividends Reinvested |  |  | 29,599 |
Cash Invested |  |  | 23,740 |
Vesting of Restricted Stock Units |  |  | 29,100 |
Restricted Stock Issued to Directors |  |  | 15,700 |
Directors Deferred Compensation |  |  | 594 |
Retirements: |  |  |  |
Shares Withheld for Individual Income Tax Requirements |  |  | (55,224 | )
Common Shares Outstanding, December 31, 2019 |  |  | 40,157,591 |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | 2019 |  |  | 2018 |  |  | 2017 |
Weighted Average Common Shares Outstanding – Basic |  |  | 39,720,847 |  |  |  | 39,599,944 |  |  |  | 39,457,261 |
Plus Outstanding Share Awards net of Share Reductions for Unrecognized Stock-Based Compensation Expense and Excess Tax Benefits: |  |  |  |  |  |  |  |  |  |  |  |
Shares Expected to be Awarded for Stock Performance Awards Granted to Executive Officers based on Measurement Period-to-Date Performance |  |  | 147,001 |  |  |  | 212,043 |  |  |  | 210,784 |
Underlying Shares Related to Nonvested Restricted Stock Units Granted to Employees |  |  | 65,421 |  |  |  | 59,980 |  |  |  | 56,952 |
Nonvested Restricted Shares |  |  | 15,377 |  |  |  | 17,751 |  |  |  | 20,380 |
Shares Expected to be Issued Under the Employee Stock Purchase Plan |  |  | 3,228 |  |  |  | - |  |  |  | - |
Shares Expected to be Issued Under the Deferred Compensation Program for Directors |  |  | 1,952 |  |  |  | 2,478 |  |  |  | 2,970 |
Total Dilutive Shares |  |  | 232,979 |  |  |  | 292,252 |  |  |  | 291,086 |
Weighted Average Common Shares Outstanding – Diluted |  |  | 39,953,826 |  |  |  | 39,892,196 |  |  |  | 39,748,347 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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