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Note 5 - Common Shares and Earnings Per Share (Tables) | 6 Months Ended
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Jun. 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 |  |  | 500,684 |
Automatic Dividend Reinvestment and Share Purchase Plan: |  |  |  |
Dividends Reinvested |  |  | 63,929 |
Cash Invested |  |  | 30,345 |
Executive Stock Performance Awards (2017 awards earned) |  |  | 62,497 |
Vesting of Restricted Stock Units |  |  | 35,720 |
Employee Stock Purchase Plan: |  |  |  |
Cash Invested |  |  | 13,432 |
Dividends Reinvested |  |  | 4,835 |
Restricted Stock Issued to Directors |  |  | 17,400 |
Directors Deferred Compensation |  |  | 612 |
Retirements: |  |  |  |
Shares Withheld for Individual Income Tax Requirements |  |  | (38,217 | )
Common Shares Outstanding, June 30, 2020 |  |  | 40,848,828 |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Three Months ended June 30 |  |  | Six Months ended June 30 |
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Weighted Average Common Shares Outstanding – Basic |  |  | 40,513,286 |  |  |  | 39,712,036 |  |  |  | 40,365,214 |  |  |  | 39,684,679 |
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 |  |  | 97,401 |  |  |  | 134,137 |  |  |  | 111,519 |  |  |  | 146,148 |
Underlying Shares Related to Nonvested Restricted Stock Units Granted to Employees |  |  | 47,331 |  |  |  | 60,168 |  |  |  | 55,614 |  |  |  | 61,783 |
Shares Expected to be Issued Under the Employee Stock Purchase Plan |  |  | 15,833 |  |  |  | - |  |  |  | 15,905 |  |  |  | - |
Nonvested Restricted Shares |  |  | 1,637 |  |  |  | 9,657 |  |  |  | 10,749 |  |  |  | 15,790 |
Shares Expected to be Issued Under the Deferred Compensation Program for Directors |  |  | 1,273 |  |  |  | 1,833 |  |  |  | 1,548 |  |  |  | 2,099 |
Total Dilutive Shares |  |  | 163,475 |  |  |  | 205,795 |  |  |  | 195,335 |  |  |  | 225,820 |
Weighted Average Common Shares Outstanding – Diluted |  |  | 40,676,761 |  |  |  | 39,917,831 |  |  |  | 40,560,549 |  |  |  | 39,910,499 |

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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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