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Note 11 - Earnings Per Share (Details Textual) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Employee Stock Option [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 279,200 189,500 193,200 215,800
Restricted Stock [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 7,000 3,000   3,400