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Note 1 - Description of Business and Summary of Significant Accounting Policies - Reconciliation of Basic to Diluted Weighted-average Shares Outstanding (Details) - shares
shares in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Weighted-average shares outstanding – basic (in shares) 71,848 68,330 57,862
Weighted-average shares underlying stock options and restricted shares (in shares) 916 657 502
Weighted-average shares outstanding - diluted (in shares) 72,764 68,987 58,364