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Note 9 - Stockholders' Equity (Details Textual)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended 36 Months Ended
Feb. 20, 2020
USD ($)
shares
Jul. 19, 2019
$ / shares
shares
May 07, 2019
USD ($)
shares
Feb. 19, 2019
shares
Jul. 07, 2014
$ / shares
shares
Jul. 01, 2004
shares
Jun. 30, 2004
shares
Jul. 30, 2020
shares
Jul. 30, 2019
shares
Feb. 28, 2019
USD ($)
Jul. 30, 2018
shares
Dec. 31, 2020
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
Dec. 31, 2017
USD ($)
Feb. 28, 2020
shares
Dec. 31, 2015
Dec. 31, 2014
shares
Dec. 31, 2013
shares
Dec. 31, 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 (in shares)                       5,000,000 5,000,000 5,000,000                      
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares                       $ 0.001 $ 0.001 $ 0.001                      
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares)                                               1,000,000  
Share Repurchase Program Additional Number of Shares Authorized To Be Repurchased (in shares)                             5,700,000         5,700,000 5,700,000   5,700,000    
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased (in shares)                       497,608 497,608                        
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights, Outstanding Number (in shares) [2]                       289,069 [1] 289,069 [1] 642,253                      
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights, Exercisable Number (in shares) [2],[3]                       289,069 289,069                        
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights, Grants in Period (in shares)                         0 [2] 0 0                    
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights, Exercises in Period, Intrinsic Value | $                         $ 6,876 $ 629 $ 384                    
Projected Revenue Goal | $     $ 41,000                                            
Non-employee Director [Member]                                                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Annual Vesting, Percentage                       25.00% 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% 25.00%                        
Share-based Compensation Arrangement by Share-based Payment Award, Remaining Vesting Period (Month)                       36 months                          
The 2002 Stock Incentive Plan [Member]                                                  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)                       0 0                        
The 2003 Director Stock Option Plan [Member]                                                  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)                         10 years                        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)                       1,350,000 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 (in shares)             38,000                                    
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period (Month)           6 months                                      
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 (in shares)           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 (in shares)           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 (in shares)           15,000                                      
The 2002 Employee Stock Purchase Plan [Member]                                                  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)                       334,486 334,486                       3,050,000
Period Employees Eligible To Participate in Employee Stock Purchase Plan (Month)                         5 months                        
Minimum Working Hours for Eligibility of Employee Stock Purchase Plan                         20                        
Maximum [Member]                                                  
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights, Outstanding Number (in shares)                       280,427 280,427                        
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights, Exercisable Number (in shares)                       280,427 280,427                        
Maximum [Member] | The2011 Stock Incentive Plan [Member]                                                  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)                       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 (Month)         36 months                                        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)         4 years                                        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)         113,000                                        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Employees Granted Shares (in 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 (in dollars per share) | $ / shares         $ 15.17                                        
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)         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] | Acquisition of Hillcrest Labs [Member]                                                  
Share-based Compensation Arrangement by Share-based Payment Award, Remaining Vesting Period (Month) 24 months 24 months                                              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 3 years 3 years                                              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)   52,000                                              
Share-based Compensation Arrangement by Share-based Payment Award, Number of Employees Granted Shares (in 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 (in dollars per share) | $ / 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% 34.00%                                              
Restricted Stock Units (RSUs) [Member] | Non-employee Director [Member]                                                  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)                             2 years 1 year                  
Restricted Stock Units (RSUs) [Member] | Employees [Member]                                                  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)                           3 years                      
Restricted Stock Units (RSUs) [Member] | Chief Executive Officer [Member]                                                  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)     3 years 3 years                                          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)     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 (in shares)               26,984 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 (Year)                           3 years                      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)     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 (in shares)     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                       103.00% 103.00% 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] | Key Employees [Member]                                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 18,500                                                
Performance Share Units [Member] | Key Employees [Member] | Key Employees PSUs Goals One [Member]                                                  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 50.00%                                                
Performance Share Units [Member] | Key Employees [Member] | Key Employees PSUs Goals Two [Member]                                                  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 30.00%                                                
Performance Share Units [Member] | Key Employees [Member] | Key Employees PSUs Goals Three [Member]                                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)                         4,515                        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 20.00%                                                
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%                                            
Short-Term Executive PSUs [Member]                                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Addtional Shares Issuable, Performance Goals Exceeded, Percentage 20.00%                                                
Short-Term Executive PSUs [Member] | Goals One [Member]                                                  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 50.00%                                                
Short-Term Executive PSUs [Member] | Goals Two [Member]                                                  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 50.00%                                                
Short-Term Executive PSUs [Member] | Vesting on February 20, 2021 [Member]                                                  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage                         33.40%                        
Short-Term Executive PSUs [Member] | Vesting on February 22, 2022 [Member]                                                  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage                         33.30%                        
Short-Term Executive PSUs [Member] | Vesting on February 20, 2023 [Member]                                                  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage                         33.30%                        
Short-Term Executive PSUs [Member] | Chief Executive Officer [Member]                                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 17,045                       19,261                        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Addtional Shares Issuable, Performance Goals Exceeded (in shares) 3,410                                                
Short-Term Executive PSUs [Member] | Executive Vice President, Worldwide Sales [Member]                                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 5,113                       5,778                        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Addtional Shares Issuable, Performance Goals Exceeded (in shares) 1,023                                                
Short-Term Executive PSUs [Member] | Chief Financial Officer [Member]                                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 4,545                       5,136                        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Addtional Shares Issuable, Performance Goals Exceeded (in shares) 909                                                
Short-Term Executive PSUs [Member] | Chief Operating Officer [Member]                                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 4,545                       5,136                        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Addtional Shares Issuable, Performance Goals Exceeded (in shares) 909                                                
Long-term PSUs [Member]                                                  
Performance Goal, Minimum Market Cap for at Lease 30 Trading Days | $ $ 1,000,000                                                
Long-term PSUs [Member] | Chief Executive Officer [Member]                                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 56,818                                                
Long-term PSUs [Member] | Executive Vice President, Worldwide Sales [Member]                                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 35,511                                                
Long-term PSUs [Member] | Chief Financial Officer [Member]                                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 28,409                                                
Long-term PSUs [Member] | Chief Operating Officer [Member]                                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 28,409                                                
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 (in shares)                       1,250,316 1,250,316                        
The2011 Stock Incentive Plan [Member]                                                  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)                                           3,200,000      
Rule 10b-18, Authorization Two [Member]                                                  
Share Repurchase Program Additional Number of Shares Authorized To Be Repurchased (in shares)                                   700,000              
[1] Due to the ceiling imposed on the SAR grants, the outstanding amount equals a maximum of 280,427 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 280,427 shares of the Company's common stock issuable upon exercise.