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Note 4 - Stockholders' Equity (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Oct. 25, 2016
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value       $ 0.2    
Stock Repurchase Program, Authorized Amount $ 25.0          
Stock Repurchase Program, Period in Force 2 years          
Treasury Stock, Shares, Acquired   276,279   276,279    
Treasury Stock Acquired, Average Cost Per Share       $ 17.27    
Treasury Stock, Value, Acquired, Cost Method       $ 4.8    
Stock Repurchase Program, Remaining Authorized Repurchase Amount   $ 20.2   $ 20.2    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       4 years    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period       3,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number   1,200,000   1,200,000   1,364,000
Share Price   $ 16.45   $ 16.45    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value       $ 3.1    
Employee Stock Option [Member]            
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized   $ 1.0   $ 1.0    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition       3 years 146 days    
Restricted Stock Units (RSUs) [Member]            
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized   $ 26.1   $ 26.1    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition       3 years    
Twenty Eleven Stock Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized   9,050,000   9,050,000    
Share Based Compensation Arrangement By Share Based Payment Award Shares Reserved Decrease Rate       1.33    
Common Stock, Capital Shares Reserved for Future Issuance   9,600,000   9,600,000    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant   2,500,000   2,500,000    
Twenty Eleven Stock Incentive Plan [Member] | Employee Stock Option [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period       10 years    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       4 years    
Shares Previously Issued Under the 2001 Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized   3,500,000   3,500,000    
IDS Plan [Member] | Employee Stock Option [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period       10 years    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       4 years    
Two Thousand One Stock Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period       500,000    
Outside of the 2011, 2001 or IDS Plans [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number   0   0    
Employee Stock Purchase Plan [Member]            
Number Of ESPP Shares Available For Future Issuance   4,400,000   4,400,000    
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate   10.00%   10.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent       85.00%    
ESPP Maximum Annual Share Replenishment       675,000    
ESPP Maximum Annual Share Replenishment Percentage of Prior Year Outstanding Company Common Stock       2.00%    
Stock Issued During Period, Shares, Employee Stock Purchase Plans   0 0 100,000 84,000  
Employee Stock Purchase Plan Weighted Average Purchase Price of Shares Purchased       $ 9.13 $ 9.21  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized   $ 0.6   $ 0.6    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition       324 days    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period       10 years