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Note 9 - Basic and Diluted Earnings Per Common Share (Details Textual) - $ / shares
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Stock Repurchase [Member]    
Stock Repurchased and Retired During Period, Shares 0 98,178
Employee Stock Option [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 28,500  
Business Acquisition, Pro Forma Earnings Per Share, Diluted   $ 130,475