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Note 5 - Common Shares and Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2020
Notes Tables |
Schedule of Common Stock Outstanding Roll Forward [Table Text Block] |
Common Shares Outstanding, December 31, 2019 |  |  | 40,157,591 |
Issuances: |  |  |  |
At-the-Market Offering |  |  | 588,084 |
Automatic Dividend Reinvestment and Share Purchase Plan: |  |  |  |
Dividends Reinvested |  |  | 102,042 |
Cash Invested |  |  | 88,636 |
Executive Stock Performance Awards (2017 awards earned) |  |  | 62,497 |
Vesting of Restricted Stock Units |  |  | 35,720 |
Employee Stock Purchase Plan: |  |  |  |
Cash Invested |  |  | 29,894 |
Dividends Reinvested |  |  | 7,906 |
Restricted Stock Issued to Directors |  |  | 17,400 |
Directors Deferred Compensation |  |  | 612 |
Retirements: |  |  |  |
Shares Withheld for Individual Income Tax Requirements |  |  | (38,217 | )
Common Shares Outstanding, September 30, 2020 |  |  | 41,052,165 |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Three Months ended September 30 |  |  | Nine Months ended September 30 |
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Weighted Average Common Shares Outstanding – Basic |  |  | 40,913,972 |  |  |  | 39,714,672 |  |  |  | 40,548,133 |  |  |  | 39,694,677 |
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 |  |  | 98,012 |  |  |  | 149,023 |  |  |  | 107,017 |  |  |  | 147,106 |
Underlying Shares Related to Nonvested Restricted Stock Units Granted to Employees |  |  | 48,682 |  |  |  | 68,138 |  |  |  | 53,303 |  |  |  | 63,902 |
Shares Expected to be Issued Under the Employee Stock Purchase Plan |  |  | 13,182 |  |  |  | - |  |  |  | 14,997 |  |  |  | - |
Nonvested Restricted Shares |  |  | 2,603 |  |  |  | 13,107 |  |  |  | 8,033 |  |  |  | 14,896 |
Shares Expected to be Issued Under the Deferred Compensation Program for Directors |  |  | 1,238 |  |  |  | 1,799 |  |  |  | 1,445 |  |  |  | 1,999 |
Total Dilutive Shares |  |  | 163,717 |  |  |  | 232,067 |  |  |  | 184,795 |  |  |  | 227,903 |
Weighted Average Common Shares Outstanding – Diluted |  |  | 41,077,689 |  |  |  | 39,946,739 |  |  |  | 40,732,928 |  |  |  | 39,922,580 |

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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://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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