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Note 10 - Common Stock and Stock-based Compensation Plans (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Feb. 14, 2022
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2021
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights, Outstanding Number (in shares) [2]   109,000 [1]   109,000 [1]     126,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights, Exercisable Number (in shares) [2],[3]   109,000   109,000        
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights, Grants in Period (in shares)   0 0 0 [2]        
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        
Maximum [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights, Outstanding Number (in shares)   108,250   108,250        
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights, Exercisable Number (in shares)   108,250   108,250        
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] | 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] | Vesting on February 17, 2023 [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 33.40%              
Restricted Stock Units (RSUs) [Member] | Vesting on February 17, 2024 [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 33.30%              
Restricted Stock Units (RSUs) [Member] | Vesting on February 17, 2025 [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 33.30%              
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] | The2011 Stock Incentive Plan [Member] | Chief Executive Officer [Member]                
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 9,935              
Restricted Stock Units (RSUs) [Member] | The2011 Stock Incentive Plan [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) 5,961              
Restricted Stock Units (RSUs) [Member] | The2011 Stock Incentive Plan [Member] | Chief Financial Officer [Member]                
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 7,451              
Restricted Stock Units (RSUs) [Member] | The2011 Stock Incentive Plan [Member] | Chief Operating Officer [Member]                
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 5,961              
Performance Share Units [Member] | The2011 Stock Incentive Plan [Member] | Chief Executive Officer [Member]                
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 14,903              
Performance Share Units [Member] | The2011 Stock Incentive Plan [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) 3,974              
Performance Share Units [Member] | The2011 Stock Incentive Plan [Member] | Chief Financial Officer [Member]                
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 4,969              
Performance Share Units [Member] | The2011 Stock Incentive Plan [Member] | Chief Operating Officer [Member]                
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 3,974              
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] | Vesting on February 17, 2023 [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage       33.40%        
Short-Term Executive PSUs [Member] | Vesting on February 17, 2024 [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage       33.30%        
Short-Term Executive PSUs [Member] | Vesting on February 17, 2025 [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage       33.30%        
Short-Term Executive PSUs [Member] | Goals One [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 50.00%              
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Threshold, Percentage 90.00%              
Short-Term Executive PSUs [Member] | Goals One [Member] | Full Vesting Based on The Achievement of 2022 License Target [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 50.00%              
Short-Term Executive PSUs [Member] | Goals One [Member] | Increase in Eligible PSUs, Percent [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Conditional Increase in Shares, Percentage 2.00%              
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] | Goals Two [Member] | Increase in Eligible PSUs, Percent [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Conditional Increase in Shares, Percentage 2.00%              
Short-Term Executive PSUs [Member] | Goals Two [Member] | Full Vesting Based on The Achievement of Positive Shareholder Return [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 50.00%              
Short-Term Executive PSUs [Member] | Goals Two [Member] | Vesting Based on Actual Return Being at Least 90 Percent of S&P500 Index [Member]                
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Threshold, Percentage 90.00%              
Short-Term Executive PSUs [Member] | Goals Two [Member] | Vesting Based on Actual Return In Excess of 100 Percent of S&P500 Index [Member]                
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Threshold, Percentage 100.00%              
Short-Term Executive PSUs [Member] | Chief Executive Officer [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Addtional Shares Issuable, Performance Goals Exceeded (in shares) 2,981              
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, Addtional Shares Issuable, Performance Goals Exceeded (in shares) 795              
Short-Term Executive PSUs [Member] | Chief Financial Officer [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Addtional Shares Issuable, Performance Goals Exceeded (in shares) 994              
Short-Term Executive PSUs [Member] | Chief Operating Officer [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Addtional Shares Issuable, Performance Goals Exceeded (in shares) 795              
Short-Term Executive PSUs [Member] | Maximum [Member] | Goals One [Member] | Vesting Based on Achievement In Excess of 90 Percent [Member]                
Share-Based Compensation Arrangement by Share-Based Payment Award, Actual Performance Results, in Excess of Performance Threshold, Percentage 110.00%              
Short-Term Executive PSUs [Member] | Maximum [Member] | Goals Two [Member] | Vesting Based on Actual Return Being at Least 90 Percent of S&P500 Index [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 99.00%              
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Threshold, Percentage 99.00%              
Short-Term Executive PSUs [Member] | Maximum [Member] | Goals Two [Member] | Vesting Based on Actual Return In Excess of 100 Percent of S&P500 Index [Member]                
Share-Based Compensation Arrangement by Share-Based Payment Award, Actual Performance Results, in Excess of Performance Threshold, Percentage 110.00%              
Short-Term Executive PSUs [Member] | Minimum [Member] | Goals One [Member] | Vesting Based on Achievement In Excess of 90 Percent [Member]                
Share-Based Compensation Arrangement by Share-Based Payment Award, Actual Performance Results, in Excess of Performance Threshold, Percentage 1.00%              
Short-Term Executive PSUs [Member] | Minimum [Member] | Goals Two [Member] | Vesting Based on Actual Return Being at Least 90 Percent of S&P500 Index [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 91.00%              
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Threshold, Percentage 90.00%              
Short-Term Executive PSUs [Member] | Minimum [Member] | Goals Two [Member] | Vesting Based on Actual Return In Excess of 100 Percent of S&P500 Index [Member]                
Share-Based Compensation Arrangement by Share-Based Payment Award, Actual Performance Results, in Excess of Performance Threshold, Percentage 1.00%              
RSUs and PSUs [Member]                
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)       413,619        
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total   $ 25,099   $ 25,099        
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)       1 year 8 months 12 days        
[1] Due to the ceiling imposed on the SAR grants, the outstanding amount equals a maximum of 108,250 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 108,250 shares of the Company’s common stock issuable upon exercise.