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Note 10 - Earnings Per Share (Details) - Dilutive Shares Included in Calculation of Diluted Earnings Per Share - shares
shares in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dilutive Shares Included in Calculation of Diluted Earnings Per Share [Abstract]        
Unvested share-based awards 0.2 0.3 0.2 0.3
Detachable warrants to purchase common shares 0.7 1.8 0.7 1.9
Total 0.9 2.1 0.9 2.2