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Note 5 - Common Shares and Earnings Per Share - Reconciliation of Weighted Average Common Shares Outstanding (Details) - shares
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Weighted Average Common Shares Outstanding – Basic (in shares) 39,720,847 39,599,944 39,457,261
Shares Expected to be Awarded for Stock Performance Awards Granted to Executive Officers based on Measurement Period-to-Date Performance (in shares) 147,001 212,043 210,784
Underlying Shares Related to Nonvested Restricted Stock Units Granted to Employees (in shares) 65,421 59,980 56,952
Nonvested Restricted Shares (in shares) 15,377 17,751 20,380
Shares Expected to be Issued Under the Employee Stock Purchase Plan (in shares) 3,228 0 0
Shares Expected to be Issued Under the Deferred Compensation Program for Directors (in shares) 1,952 2,478 2,970
Total Dilutive Shares (in shares) 232,979 292,252 291,086
Weighted Average Common Shares Outstanding – Diluted (in shares) 39,953,826 39,892,196 39,748,347