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Note 17 - Earnings Per Share (Details Textual) - shares
shares in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Jun. 30, 2017
Employee Stock Option [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount   3.2 4.0
Restricted Stock [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 2.3