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Note 8 - Stockholders' Equity - Summary of Option Activity for Employees and Non-employees (Details) - Share-Based Payment Arrangement, Option [Member] - USD ($)
6 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2022
Sep. 30, 2022
Dec. 31, 2021
Share-Based Payment Arrangement, Employee [Member]      
Number of options (in shares) 2,843,693 2,843,693  
Weighted average exercise price, outstanding (in dollars per share) $ 2.39 $ 2.39  
Weighted average remaining contractual life, outstanding (Year)   6 years 7 months 17 days 7 years 8 months 8 days
Aggregate intrinsic value, outstanding   $ 0 $ 49,246
Number of options, granted (in shares)   216,296  
Weighted average exercise price, granted (in dollars per share)   $ 1.52  
Weighted average remaining contractual life, granted (Year)   2 years 2 months 23 days  
Number of options, exercised (in shares)   0  
Weighted average exercise price, exercised (in dollars per share)   $ 0  
Number of options, forfeited or expired (in shares)   0  
Weighted average exercise price, forfeited or expired (in dollars per share)   $ 0  
Number of options (in shares)   3,059,989 2,843,693
Weighted average exercise price, outstanding (in dollars per share)   $ 2.29 $ 2.39
Number of options exercisable (in shares)   994,914  
Weighted average exercise price, exercisable (in dollars per share)   $ 2.18  
Weighted average remaining contractual life, exercisable (Year)   5 years 3 months 10 days  
Aggregate intrinsic value, exercisable   $ 0  
Share-Based Payment Arrangement, Nonemployee [Member]      
Number of options (in shares)     83,330
Weighted average exercise price, outstanding (in dollars per share)     $ 1.85
Weighted average remaining contractual life, outstanding (Year) 2 years 6 months 29 days   3 years 3 months 29 days
Aggregate intrinsic value, outstanding $ 4,333   $ 49,748
Number of options (in shares) 83,330    
Weighted average exercise price, outstanding (in dollars per share) $ 1.85    
Number of options exercisable (in shares) 69,441    
Weighted average exercise price, exercisable (in dollars per share) $ 1.68    
Weighted average remaining contractual life, exercisable (Year) 2 years 4 months 13 days    
Aggregate intrinsic value, exercisable $ 4,333