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Note 5 - Common Shares and Earnings Per Share - Reconciliation of Weighted Average Common Shares Outstanding (Details) - shares
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Weighted Average Common Shares Outstanding – Basic (in shares) 40,513,286 39,712,036 40,365,214 39,684,679
Shares Expected to be Awarded for Stock Performance Awards Granted to Executive Officers based on Measurement Period-to-Date Performance (in shares) 97,401 134,137 111,519 146,148
Underlying Shares Related to Nonvested Restricted Stock Units Granted to Employees (in shares) 47,331 60,168 55,614 61,783
Shares Expected to be Issued Under the Employee Stock Purchase Plan (in shares) 15,833 0 15,905 0
Nonvested Restricted Shares (in shares) 1,637 9,657 10,749 15,790
Shares Expected to be Issued Under the Deferred Compensation Program for Directors (in shares) 1,273 1,833 1,548 2,099
Total Dilutive Shares (in shares) 163,475 205,795 195,335 225,820
Weighted Average Common Shares Outstanding – Diluted (in shares) 40,676,761 39,917,831 40,560,549 39,910,499