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Note 6 - Equity Incentive Plan (Details Textual) - USD ($)
shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Restricted Stock and Restricted Stock Units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 1.2 $ 0.8
Employee Stock Option [Member] | Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 0.4  
Restricted Stock Units (RSUs) [Member] | Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 1 year