Annual report pursuant to Section 13 and 15(d)

Note 8 - Stock-based Incentive Plans (Details Textual)

v3.23.1
Note 8 - Stock-based Incentive Plans (Details Textual) - USD ($)
12 Months Ended
Dec. 01, 2022
Jan. 01, 2022
Dec. 31, 2022
Dec. 31, 2021
Jun. 30, 2022
May 31, 2021
Jul. 31, 2020
Oct. 31, 2018
Jul. 31, 2017
May 31, 2016
Oct. 31, 2014
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 1.17 $ 3.40              
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested in Period, Fair Value     $ 1,726,000 $ 720,000              
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount     2,204,000                
Share-Based Payment Arrangement, Expense     $ 4,263,000 $ 2,381,000              
Stock Award Sales Program [Member]                      
Share-Based Compensation Arrangement by Share-Based Payment Award, Purchase Price of Common Stock, Percent     100.00%                
Common Stock, Capital Shares Reserved for Future Issuance         6,250,000 5,000,000 2,583,334 1,833,334 1,500,000 1,000,000 583,334
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant     1,139,074                
Share-Based Payment Arrangement, Option [Member]                      
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period     10 years                
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition     2 years 1 month 28 days                
Non-statutory Options [Member] | Discretionary Option Grant Program [Member]                      
Share-Based Compensation Arrangement by Share-Based Payment Award, Purchase Price of Common Stock, Percent     85.00%                
Incentive Stock Options [Member] | Discretionary Option Grant Program [Member] | Eligible Employees Owns Equal or Less Than 10% of Voting Stock [Member]                      
Share-Based Compensation Arrangement by Share-Based Payment Award, Purchase Price of Common Stock, Percent     110.00%                
Restricted Stock Units (RSUs) [Member]                      
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount     $ 983,000                
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)     $ 1.52                
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)     362,000                
Restricted Stock Units (RSUs) [Member] | Share-Based Payment Arrangement, Nonemployee [Member]                      
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount     $ 24,000                
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Granted     170,000                
Share-Based Payment Arrangement, Expense     $ 131,000                
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)     $ 0.91                
Performance Stock Units [Member]                      
Share-Based Payment Arrangement, Expense     $ 2,142,000                
Performance Stock Units [Member] | Super League 2014 Amended and Restated Stock Option and Incentive Plan [Member]                      
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Granted   1,350,000                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting, Number of Shares Required Vested   270,000                  
Performance Stock Units [Member] | Super League 2014 Amended and Restated Stock Option and Incentive Plan [Member] | Share-Based Payment Arrangement, Tranche One [Member]                      
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Requirement, Stock Price   $ 4.75                  
Performance Stock Units [Member] | Super League 2014 Amended and Restated Stock Option and Incentive Plan [Member] | Share-Based Payment Arrangement, Tranche Two [Member]                      
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Requirement, Stock Price   6.00                  
Performance Stock Units [Member] | Super League 2014 Amended and Restated Stock Option and Incentive Plan [Member] | Share-Based Payment Arrangement, Tranche Three [Member]                      
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Requirement, Stock Price   7.00                  
Performance Stock Units [Member] | Super League 2014 Amended and Restated Stock Option and Incentive Plan [Member] | Share-Based Payment Arrangement, Tranche Four [Member]                      
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Requirement, Stock Price   8.00                  
Performance Stock Units [Member] | Super League 2014 Amended and Restated Stock Option and Incentive Plan [Member] | Share-Based Payment Arrangement, Tranche Five [Member]                      
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Requirement, Stock Price   $ 9.00                  
Stock Warrants [Member]                      
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount     $ 228,000                
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Granted     500,000 0              
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)     $ 0.50                
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)     0 0              
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Exercise Price     $ 0.67                
Stock Warrants [Member] | Share-Based Payment Arrangement, Nonemployee [Member]                      
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period 5 years                    
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Granted 500,000                    
Share-Based Payment Arrangement, Expense     $ 20,000                
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) $ 0.50                    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Exercise Price $ 0.67