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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 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dilutive Shares Included in Calculation of Diluted Earnings Per Share [Abstract]        
Unvested share-based awards 0.2 0.2 0.2 0.3
Detachable warrants to purchase common shares   1.3 0.4 1.7
Total 0.2 1.5 0.6 2.0