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Note 4 - Stockholders' Equity (Details) (USD $)
 0 Months Ended 1 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 1 Months Ended 25 Months Ended 19 Months Ended 3 Months Ended 6 Months Ended
Nov. 08, 2012
May 28, 2013
Oct. 29, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Nov. 16, 2011
Jun. 30, 2013
2011 Stock Incentive Plan [Member]
Jun. 30, 2013
IDS Plan [Member]
Jun. 30, 2013
Employee Stock Option [Member]
Jun. 30, 2013
Restricted Stock [Member]
Jun. 30, 2013
Employee Stock Purchase Plan [Member]
Oct. 29, 2007
Stock Repurchase Program [Member]
Oct. 29, 2012
Stock Repurchase Program [Member]
Jun. 30, 2013
Shares Previously Issued Under the 2001 Plan [Member]
Jun. 30, 2013
2001 Stock Incentive Plan [Member]
Jun. 30, 2013
Employee Stock Purchase Plan [Member]
Jun. 30, 2012
Employee Stock Purchase Plan [Member]
Jun. 30, 2013
Employee Stock Purchase Plan [Member]
Jun. 30, 2012
Employee Stock Purchase Plan [Member]
Note 4 - Stockholders' Equity (Details) [Line Items]                                        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       4 years       4 years 4 years                      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares)   4,800,000         3,200,000               3,500,000          
Share Based Compensation Arrangement By Share Based Payment Award Shares Reserved Decrease Rate (in Shares)       1.33                                
Share Based Compensation Arrangement By Share Based Payment Award Expiration Term               10 years 10 years                      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in Shares)   1,600,000                                    
Common Stock, Capital Shares Reserved for Future Issuance (in Shares)       5,200,000                                
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares)       2,700,000                                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period (in Shares)       72,000                       400,000        
Share Price (in Dollars per share)       $ 18.43                                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value                   $ 4,600,000                    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized                   5,100,000                    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition                   2 years 124 days 3 years 109 days 1 year 6 months                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value       1,500,000                                
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options                     10,300,000 700,000                
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate       10.00%                                
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent       85.00%                                
ESPP Maximum Annual Share Replenishment (in Shares)       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 (in Shares)       104,000 97,000                              
Employee Stock Purchase Plan Weighted Average Purchase Price Of Shares Purchased (in Dollars per share)       $ 5.24 $ 4.81                              
Share-based Compensation       3,018,000 2,224,000                       200,000 100,000 400,000 200,000
Number Of ESPP Shares Available For Future Issuance (in Shares)                                 1,300,000   1,300,000  
Stock Repurchase Program, Authorized Amount 20,000,000                       10,000,000 10,000,000            
Stock Repurchase Program, Remaining Authorized Repurchase Amount       19,500,000                   19,300,000            
Stock Repurchased During Period, Shares (in Shares)     3,800,000 36,100                                
Treasury Stock Acquired, Average Cost Per Share (in Dollars per share)     $ 4.53                                  
Treasury Stock, Value, Acquired, Cost Method     17,000,000                                  
Stock Repurchsed During Period Average Per Share Price (in Dollars per share)       $ 13.23                                
Stock Repurchased During Period, Value       $ 500,000