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Note 9 - Basic and Diluted Earnings Per Common Share (Details Textual) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Stock Repurchase [Member]        
Stock Repurchased and Retired During Period, Shares 0 398,000 308,416 637,502
Tender Offer [Member]        
Stock Repurchased and Retired During Period, Shares       193,907
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 76,750   95,950