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Note 10 - Common Stock and Stock-based Compensation Plans (Details Textual) - USD ($)
$ in Thousands
6 Months Ended
May 07, 2019
Feb. 19, 2019
Jun. 30, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights, Outstanding Number [2]     670,813 [1] 702,817
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights, Exercisable Number [2],[3]     600,098  
Non-employee Director [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Annual Vesting, Percentage     25.00%  
Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     4 years  
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights, Outstanding Number     618,297  
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights, Exercisable Number     548,136  
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%  
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  
Stock Options and SARs [Member]        
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total     $ 71  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition     1 year 36 days  
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] | Chief Executive Officer [Member] | First Group of Awards to Vest, Vesting on February 19, 2020 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 33.33%      
Restricted Stock Units (RSUs) [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%      
Restricted Stock Units (RSUs) [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%      
Restricted Stock Units (RSUs) [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] | 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      
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%      
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%      
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%      
RSUs and PSUs [Member]        
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total     $ 16,453  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition     1 year 219 days  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     375,600  
[1] Due to the ceiling imposed on the SAR grants, the outstanding amount equals a maximum of 618,297 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 548,136 shares of the Company's common stock issuable upon exercise.