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Note 9 - Basic and Diluted Earnings Per Common Share (Details Textual) - shares
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Stock Repurchased and Retired During Period, Shares 0 0
Employee Stock Option [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 333,300 28,500