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Note 6 - Stockholders' Equity (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Jul. 16, 2024
Jan. 12, 2024
Dec. 10, 2023
Jul. 31, 2024
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Jun. 28, 2023
Dec. 31, 2022
Stock Issued During Period Shares, Warrants Exercised (in shares)             103,500        
Class of Warrant or Right, Exercised During Period, Exercise Price (in dollars per share)             $ 0.5        
Proceeds from Warrant Exercises             $ 51,751 $ 0      
Deferred Compensation Arrangement with Individual, Shares Authorized for Issuance (in shares)         3,184,683 2,809,060 3,184,683 2,809,060 3,098,917   2,440,673
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)             6 months        
Share-Based Payment Arrangement, Option [Member]                      
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount         $ 1,000,000   $ 1,000,000        
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)             1 year 6 months        
Share-Based Payment Arrangement, Option [Member] | Share-Based Payment Arrangement, Nonemployee [Member]                      
Share-Based Payment Arrangement, Expense         7,000 $ 3,800 $ 9,200 $ 17,000      
Restricted Stock [Member]                      
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount         0   0        
Share-Based Payment Arrangement, Expense         0 (36,500) $ (2,100) (17,700)      
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)             730,340        
The 2020 Equity Incentive Plan [Member] | Share-Based Payment Arrangement, Option [Member]                      
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)                   11,500,000  
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)             3 years        
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)             5 years        
Share-Based Payment Arrangement, Amount Capitalized         $ 172,000 $ 321,000 $ 530,000 $ 1,100,000      
Chief Executive Officer, and Other Employees [Member]                      
Deferred Compensation Arrangement with Individual, Shares Authorized for Issuance (in shares)         2,657,058 2,426,364 2,657,058 2,426,364      
Non-Employees [Member]                      
Common Stock, Capital Shares Reserved for Future Issuance (in shares)         527,625 382,696 527,625 382,696      
Board of Directors [Member] | Restricted Stock [Member]                      
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount         $ 344,000   $ 344,000        
Share-Based Payment Arrangement, Expense         $ 306,000   $ 464,000        
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 730,340                    
Share Price (in dollars per share) $ 0.89                    
Board of Directors [Member] | Restricted Stock [Member] | Share-Based Payment Arrangement, Tranche One [Member]                      
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage       25.00%              
Board of Directors [Member] | Restricted Stock [Member] | Share-Based Payment Arrangement, Tranche Two [Member]                      
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage             25.00%        
Public Offering [Member]                      
Stock Issued During Period, Shares, New Issues (in shares)     4,765,000                
Shares Issued, Price Per Share (in dollars per share)     $ 0.63                
Proceeds from Issuance of Common Stock     $ 2,600,000                
Over-Allotment Option [Member]                      
Stock Issued During Period, Shares, New Issues (in shares)   372,110 714,750                
Proceeds from Issuance of Common Stock   $ 192,156