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Note 10 - Earnings Per Share (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Employee Stock Option [Member]        
Note 10 - Earnings Per Share (Details) [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 142,900 64,800 104,400 70,400
Restricted Stock [Member]        
Note 10 - Earnings Per Share (Details) [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 2,300