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Note 9 - Earnings Per Share - Calculation of Basic and Diluted Weighted Average Common Shares (Details) - shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Weighted average common shares outstanding basic earnings per share (in shares) 6,285,815 6,175,254
Effect of potential common share issuance:    
Stock options (in shares) 0 108,053
Weighted average common shares outstanding    
Diluted earnings per share (in shares) 6,285,815 6,283,307