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Note 5 - Share-based Compensation (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Mar. 22, 2022
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Jun. 22, 2018
Sep. 07, 2017
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2022
Sep. 30, 2021
Stock Issued During Period, Value, Issued for Services                   $ 96,000 $ 59,000 $ 17,000   $ 60,000 $ 111,000    
Stock Issued During Period, Value, New Issues                   1,117,000 $ 948,000 $ 1,202,000 $ 123,000 $ 1,414,000 $ 2,106,000    
Share-Based Payment Arrangement, Expense                   $ 338,000     $ 430,000     $ 1,455,000 $ 1,447,000
Share Price (in dollars per share) $ 0.27                 $ 0.27           $ 0.27  
2018 Equity Incentive Plan [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)               10 years                  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)               40,000,000                  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized Per Year (in shares)               2,000,000                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)                               4,748,212 3,686,462
The 2007 Equity Incentive Plan [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)                 10 years                
Non Plan [Member]                                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)                               105,797 43,956
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)                               $ 0.26 $ 0.23
Common Stock Issued for Accrued Interest Due on Promissory Note [Member]                                  
Shares Issued, Price Per Share (in dollars per share)           $ 0.17               $ 0.17      
Stock Issued During Period, Shares, New Issues (in shares)                           81,777      
Stock Issued During Period, Value, New Issues                           $ 16,000      
Officer [Member]                                  
Stock Issued During Period, Shares, Issued for Services (in shares) 167,781       61,842   137,364                    
Shares Issued, Price Per Share (in dollars per share) $ 0.27       $ 0.19   $ 0.23     0.27     $ 0.19   $ 0.23 0.27 0.19
Stock Issued During Period, Value, Issued for Services $ 72,000       $ 12,000   $ 31,000                    
Consultants [Member]                                  
Stock Issued During Period, Shares, Issued for Services (in shares) 211,047 76,996 86,752   586,963 357,132 610,123                    
Shares Issued, Price Per Share (in dollars per share) $ 0.27 $ 0.18 $ 0.23   $ 0.19 $ 0.17 $ 0.23     0.27 $ 0.18 $ 0.23 0.19 $ 0.17 $ 0.23 $ 0.27 $ 0.19
Stock Issued During Period, Value, Issued for Services $ 24,000 $ 60,000 $ 31,000   $ 71,000 $ 60,000 $ 81,000                    
Employees, Consultants, Officers, and Directors [Member] | 2018 Equity Incentive Plan [Member]                                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)                               4,748,212 3,686,462
CFO and President [Member] | 2018 Equity Incentive Plan [Member]                                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)                               290,135  
CFO and President [Member] | 2018 Equity Incentive Plan [Member] | Minimum [Member]                                  
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)                               $ 0.22  
CFO and President [Member] | 2018 Equity Incentive Plan [Member] | Maximum [Member]                                  
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)                               $ 0.23  
Board Of Directors [Member] | 2018 Equity Incentive Plan [Member]                                  
Share-Based Payment Arrangement, Expense                               $ 246,000 $ 198,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)                               1,134,356 1,049,024
Board Of Directors [Member] | 2018 Equity Incentive Plan [Member] | Minimum [Member]                                  
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)                               $ 0.18 $ 0.17
Board Of Directors [Member] | 2018 Equity Incentive Plan [Member] | Maximum [Member]                                  
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)                               $ 0.27 $ 0.23
Employees [Member] | 2018 Equity Incentive Plan [Member]                                  
Share-Based Payment Arrangement, Expense                               $ 492,000 $ 327,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)                               2,340,730 1,800,011
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)                               4 years 4 years
Employees [Member] | 2018 Equity Incentive Plan [Member] | Minimum [Member]                                  
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)                               $ 0.18 $ 0.17
Employees [Member] | 2018 Equity Incentive Plan [Member] | Maximum [Member]                                  
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)                               $ 0.27 $ 0.23
Employees and Consultants [Member] | 2018 Equity Incentive Plan [Member]                                  
Stock Issued During Period, Value, Issued for Services                               $ 145,000 $ 95,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)                               682,991 537,427
Chief Financial Officer [Member] | 2018 Equity Incentive Plan [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)       10 years                          
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)                                 300,000
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)       $ 0.24                         $ 0.17
Term Extension (Year)       1 year                          
Share-based Compensation Arrangement By Share-based Payment Award, Options Grants Per Month, Gross (in shares)       25,000                          
Vendors [Member] | Non Plan [Member]                                  
Shares Issued, Price Per Share (in dollars per share)         $ 0.23               $ 0.23       $ 0.23
Share-Based Payment Arrangement, Expense                               $ 36,000 $ 10,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)                               105,797 43,956
Vendors [Member] | Non Plan [Member] | Minimum [Member]                                  
Shares Issued, Price Per Share (in dollars per share) $ 0.23                 0.23           $ 0.23  
Vendors [Member] | Non Plan [Member] | Maximum [Member]                                  
Shares Issued, Price Per Share (in dollars per share) $ 0.27                 $ 0.27           $ 0.27