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Note 2 - Earnings Per Share (Details Textual) - shares
shares in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Incremental Common Shares Attributable to Share-based Payment Arrangements, Total 1.0 1.0 1.0 1.1