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Note 2 - Earnings Per Share - Basic and Diluted Earnings Per Common Share (Details) - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Weighted-Average Common Shares Outstanding (in shares) 4,363,346 4,363,346 4,363,346 4,363,346
Average Treasury Stock Shares (in shares) (275,321) (282,329) (275,563) (282,329)
Weighted-Average Common Shares and Common Stock Equivalents Used to Calculate Basic Earnings Per Share (in shares) 4,088,025 4,081,017 4,087,783 4,081,017
Additional Common Stock Equivalents (Stock Options and Restricted Stock) Used to Calculate Diluted Earnings Per Share (in shares) 20,698 6,320 16,374 3,713
Weighted-Average Common Shares and Common Stock Equivalents Used to Calculate Diluted Earnings Per Share (in shares) 4,108,723 4,087,337 4,104,157 4,084,730
Earnings per share:        
Basic (in dollars per share) $ 0.50 $ 0.38 $ 1.36 $ 1.36
Diluted (in dollars per share) $ 0.50 $ 0.38 $ 1.36 $ 1.36