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Note 5 - Common Shares and Earnings Per Share - Reconciliation of Company's Common Shares (Details) | 9 Months Ended
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Sep. 30, 2020 shares
Common Shares Outstanding, beginning balance (in shares) | 40,157,591
Dividends Reinvested (in shares) | 102,042
Cash Invested (in shares) | 88,636
Vesting of Restricted Stock Units (in shares) | 35,720
Cash Invested (in shares) | 29,894
Dividends Reinvested (in shares) | 7,906
Restricted Stock Issued to Directors (in shares) | 17,400
Directors Deferred Compensation (in shares) | 612
Shares Withheld for Individual Income Tax Requirements (in shares) | (38,217)
Common Shares Outstanding, ending balance (in shares) | 41,052,165
Performance Awards 2017 [Member] |
Executive Stock Performance Awards (2017 awards earned) (in shares) | 62,497
At the Market Offering [Member] |
At-the-Market Offering (in shares) | 588,084

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