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Note 9 - Stockholders' Equity (Details Textual)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Jul. 19, 2019
$ / shares
shares
May 07, 2019
shares
Feb. 19, 2019
shares
Jul. 07, 2014
$ / shares
shares
Jul. 01, 2004
shares
Jun. 30, 2004
shares
Jul. 30, 2019
shares
Feb. 28, 2019
USD ($)
Jul. 30, 2018
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
shares
May 31, 2018
shares
Dec. 31, 2014
shares
Dec. 31, 2013
shares
May 17, 2011
shares
Dec. 31, 2010
shares
Aug. 31, 2008
shares
Jul. 31, 2002
shares
Common Stock, Number of Votes Per Share                   1                  
Preferred Stock, Shares Authorized                   5,000,000                  
Preferred Stock, Par or Stated Value Per Share | $ / shares                   $ 0.001                  
Stock Repurchase Program, Number of Shares Authorized to be Repurchased                                   1,000,000  
Share Repurchase Program Additional Number of Shares Authorized To Be Repurchased                           5,000,000 5,000,000   5,000,000    
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased                   0                  
Treasury Stock, Shares, Acquired                   355,180 655,876 0              
Treasury Stock Acquired, Average Cost Per Share | $ / shares                   $ 25.66 $ 30.51                
Treasury Stock Value Acquired Weighted Average Method | $                   $ 9,113 $ 20,008                
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights, Outstanding Number [2]                   642,253 [1] 702,817                
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights, Exercisable Number [2],[3]                   616,253                  
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights, Grants in Period                   0 0 0              
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights, Exercises in Period, Intrinsic Value | $                   $ 629 $ 384 $ 15,188              
Non-employee Director [Member]                                      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Annual Vesting, Percentage                   25.00%                  
The2011 Stock Incentive Plan [Member]                                      
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights Vesting Percentage, Year One                   25.00%                  
Share-based Compensation Arrangement by Share-based Payment Award, Remaining Vesting Period                   3 years                  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized                               2,350,000      
The 2002 Stock Incentive Plan [Member]                                      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant                   0                  
The 2003 Director Stock Option Plan [Member]                                      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period                   10 years                  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized                   1,350,000                  
The 2003 Director Stock Option Plan [Member] | Non-employee Director [Member]                                      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures, Total           38,000                          
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period         180 days                            
The 2003 Director Stock Option Plan [Member] | Board of Directors [Member]                                      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures, Total         13,000                            
The 2003 Director Stock Option Plan [Member] | Committee Chairperson [Member]                                      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures, Total         13,000                            
The 2003 Director Stock Option Plan [Member] | Board of Directors Chairman [Member]                                      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures, Total         15,000                            
The 2002 Employee Stock Purchase Plan [Member]                                      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant                   109,123                 2,700,000
Period Employees Eligible To Participate in Employee Stock Purchase Plan                   150 days                  
Maximum [Member]                                      
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights, Outstanding Number                   596,877                  
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights, Exercisable Number                   570,877                  
Maximum [Member] | The2011 Stock Incentive Plan [Member]                                      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period                   4 years                  
Stock Appreciation Rights (SARs) [Member] | RivieraWaves [Member]                                      
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Awards Granted       400.00%                              
Share-based Compensation Arrangement by Share-based Payment Award, Remaining Vesting Period       3 years                              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       4 years                              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       113,000                              
Share-based Compensation Arrangement by Share-based Payment Award, Number of Employees Granted Shares       27                              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares       $ 15.17                              
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period       7 years                              
Stock Appreciation Rights (SARs) [Member] | RivieraWaves [Member] | SARs Vesting After One Year [Member]                                      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage       25.00%                              
Stock Appreciation Rights (SARs) [Member] | Maximum [Member]                                      
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Awards Granted                   400.00%                  
Percentage of Stock Appreciation Rights Units Subject to Grant                   75.00%                  
Restricted Stock Units (RSUs) [Member]                                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period                   509,309                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares                   $ 27.74                  
Restricted Stock Units (RSUs) [Member] | Acquisition of Hillcrest Labs [Member]                                      
Share-based Compensation Arrangement by Share-based Payment Award, Remaining Vesting Period 2 years                                    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years                                    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 52,000                                    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Employees Granted Shares 22                                    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares $ 25.41                                    
Restricted Stock Units (RSUs) [Member] | Acquisition of Hillcrest Labs [Member] | Restricted Stock Units Vesting After One Year [Member]                                      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 34.00%                                    
Restricted Stock Units (RSUs) [Member] | Non-employee Director [Member]                                      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period                   2 years   1 year              
Restricted Stock Units (RSUs) [Member] | Employees [Member]                                      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period                   3 years                  
Restricted Stock Units (RSUs) [Member] | Chief Executive Officer [Member]                                      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   3 years 3 years                                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   10,000 30,000                                
Restricted Stock Units (RSUs) [Member] | The2011 Stock Incentive Plan [Member] | Board of Directors [Member]                                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period             35,399   28,896                    
Restricted Stock Units (RSUs) [Member] | The2011 Stock Incentive Plan [Member] | Board of Directors Chairman [Member]                                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted, Annualized Value | $                   $ 268,520                  
Restricted Stock Units (RSUs) [Member] | The2011 Stock Incentive Plan [Member] | Directors with a Chairperson Position [Member]                                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted, Annualized Value | $                   249,340                  
Restricted Stock Units (RSUs) [Member] | The2011 Stock Incentive Plan [Member] | Other Board of Directors [Member]                                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted, Annualized Value | $                   $ 124,670                  
Restricted Stock Units (RSUs) [Member] | The2011 Stock Incentive Plan [Member] | Director [Member]                                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted, Annualized Value | $               $ 124,670                      
Performance Share Units [Member] | Chief Executive Officer [Member]                                      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period                   3 years                  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant   24,000                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Number to Be Granted If 100% License Revenue Target is Met   20,000               23,200                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Percentage of License Revenue Target, Proportional Percentage to Be Received upon Achievement                   116.00%                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Proportional Percentage to Be Received for Each Increase of 1 Percent Beyond the License Revenue Target   1.00%                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Ceiling as a Percentage of Baseline Number to Be Granted if the License Revenue Target is Exceeded   120.00%                                  
Performance Share Units [Member] | Chief Executive Officer [Member] | Vesting on February 19, 2020 [Member]                                      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage                   33.33%                  
Performance Share Units [Member] | Chief Executive Officer [Member] | Vesting on February 19, 2021 [Member]                                      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage                   33.33%                  
Performance Share Units [Member] | Chief Executive Officer [Member] | Vesting on February 19, 2022 [Member]                                      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage                   33.33%                  
Performance Share Units [Member] | Maximum [Member] | Chief Executive Officer [Member]                                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Percentage of License Revenue Target, Proportional Percentage to Be Received upon Achievement   99.00%                                  
Performance Share Units [Member] | Minimum [Member] | Chief Executive Officer [Member]                                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Percentage of License Revenue Target, Proportional Percentage to Be Received upon Achievement   90.00%                                  
Stock Options, Stock Appreciation Rights, Restricted Stock Units, and Performance Share Units [Member]                                      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant                   671,132                  
Rule 10b-18, Authorization Two [Member]                                      
Share Repurchase Program Additional Number of Shares Authorized To Be Repurchased                         700,000            
[1] Due to the ceiling imposed on the SAR grants, the outstanding amount equals a maximum of 596,877 shares of the Company's common stock issuable upon exercise.
[2] The SAR units are convertible for a maximum number of shares of the Company's common stock equal to 75% of the SAR units subject to the grant.
[3] Due to the ceiling imposed on the SAR grants, the exercisable amount equals a maximum of 570,877 shares of the Company's common stock issuable upon exercise.