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Note 6 - Equity Incentive Plan (Details Textual) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Jun. 13, 2017
Jan. 01, 2017
Retained Earnings [Member] | Accounting Standards Update 2016-09 [Member]            
Cumulative Effect of New Accounting Principle in Period of Adoption           $ (0.5)
The 2017 Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized         1.2  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 2,500   2,500      
The 2003 Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 3,000   400,000      
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 $ 1.3 $ 0.7 $ 2.5 $ 1.5    
Employee Stock Option [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     3 years      
Restricted Stock Units (RSUs) [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     1 year