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Note 8 - Stockholders' Equity (Details Textual)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Jul. 07, 2014
$ / shares
shares
Jul. 01, 2004
shares
Jun. 30, 2004
shares
Feb. 28, 2019
USD ($)
Jul. 30, 2018
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
May 31, 2018
shares
Oct. 31, 2014
shares
Dec. 31, 2013
shares
May 17, 2011
shares
Aug. 31, 2008
shares
Jul. 31, 2002
shares
Common Stock, Number of Votes Per Share           1                
Preferred Stock, Shares Authorized           5,000,000 5,000,000              
Preferred Stock, Par or Stated Value Per Share | $ / shares           $ 0.001 $ 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                     4,000,000      
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased           355,180                
Treasury Stock, Shares, Acquired           655,876 0 180,013            
Treasury Stock Acquired, Average Cost Per Share | $ / shares           $ 30.51   $ 18.98            
Treasury Stock Value Acquired Weighted Average Method | $           $ 20,008   $ 3,417            
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights, Outstanding Number [2]           702,817 [1] 729,017              
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights, Exercisable Number [2],[3]           623,718                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares               $ 12.90            
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights, Grants in Period           0 0              
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights, Exercises in Period, Intrinsic Value | $           $ 384 $ 15,188 $ 12,282            
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    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Date           Feb. 28, 2021                
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           211,204               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           642,300                
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights, Exercisable Number           565,851                
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] | SARs Vesting After One Year [Member] | RivieraWaves [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           328,896                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares           $ 34.14                
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] | Employees [Member] | Share-based Compensation Award, Tranche One [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage           0.33%                
Restricted Stock Units (RSUs) [Member] | Employees [Member] | Share-based Compensation Award, Tranche Three [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage           0.33%                
Restricted Stock Units (RSUs) [Member] | Employees [Member] | Share-based Compensation Award, Tranche Two [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage           0.33%                
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         28,896                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, per Director           38,000                
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] | Subsequent Event [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted, Annualized Value | $       $ 124,670                    
Stock Options, Stock Appreciation Rights and Restricted Stock Units [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant           1,037,600                
Rule 10b-18, Authorization Two [Member]                            
Share Repurchase Program Additional Number of Shares Authorized To Be Repurchased                 700,000 1,000,000        
[1] Due to the ceiling imposed on the SAR grants, the outstanding amount equals a maximum of 642,300 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 565,851 shares of the Company's common stock issuable upon exercise.