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Note 5 - Common Shares and Earnings Per Share - Reconciliation of Weighted Average Common Shares Outstanding (Details) - shares
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Weighted Average Common Shares Outstanding – Basic (in shares) 40,913,972 39,714,672 40,548,133 39,694,677
Shares Expected to be Awarded for Stock Performance Awards Granted to Executive Officers based on Measurement Period-to-Date Performance (in shares) 98,012 149,023 107,017 147,106
Underlying Shares Related to Nonvested Restricted Stock Units Granted to Employees (in shares) 48,682 68,138 53,303 63,902
Shares Expected to be Issued Under the Employee Stock Purchase Plan (in shares) 13,182 0 14,997 0
Nonvested Restricted Shares (in shares) 2,603 13,107 8,033 14,896
Shares Expected to be Issued Under the Deferred Compensation Program for Directors (in shares) 1,238 1,799 1,445 1,999
Total Dilutive Shares (in shares) 163,717 232,067 184,795 227,903
Weighted Average Common Shares Outstanding – Diluted (in shares) 41,077,689 39,946,739 40,732,928 39,922,580