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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.

X
- Definition Represents the number of votes per share of common stock. + References No definition available. + Details
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X
- Definition Percentage of stock appreciation rights units subject to grant. + References No definition available. + Details
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- Definition Represents the ceiling on the number of equity instruments other than options that may be granted if the license revenue target is exceeded, expressed as a percentage of the baseline number of grants. + References No definition available. + Details
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X
- Definition Represents the number of the specified type of equity instrument other than options to be granted if the entity reaches 100% of the license revenue target. + References No definition available. + Details
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X
- Definition Represents the percentage of the baseline amount of the specified type of equity instrument other than options to be granted if the entity reaches the corresponding proportion of the license revenue target. + References No definition available. + Details
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X
- Definition Represents the total intrinsic value of options and stock appreciation rights exercised during the period. + References No definition available. + Details
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X
- Definition Gross number of share options and SARs granted during the period. + References No definition available. + Details
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- Definition Number of options and stock appreciation rights outstanding. + References No definition available. + Details
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