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Note 5 - Common Shares and Earnings Per Share - Reconciliation of Weighted Average Common Shares Outstanding (Details) - shares
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Weighted Average Common Shares Outstanding – Basic (in shares) 40,217,141 39,657,321
Shares Expected to be Awarded for Stock Performance Awards Granted to Executive Officers based on Measurement Period-to-Date Performance (in shares) 125,637 158,159
Underlying Shares Related to Nonvested Restricted Stock Units Granted to Employees (in shares) 63,897 63,398
Nonvested Restricted Shares (in shares) 19,861 21,922
Shares Expected to be Issued Under the Employee Stock Purchase Plan (in shares) 15,977 0
Shares Expected to be Issued Under the Deferred Compensation Program for Directors (in shares) 1,823 2,365
Total Dilutive Shares (in shares) 227,195 245,844
Weighted Average Common Shares Outstanding – Diluted (in shares) 40,444,336 39,903,165