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Note 6 - Share-based Compensation (Details Textual) - USD ($)
 3 Months Ended 12 Months Ended
Jan. 02, 2025
Jan. 03, 2023
Mar. 31, 2025
Dec. 31, 2024
Apr. 16, 2024
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares)     6,304,597 5,788,597  
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) [1]     $ 1.74    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) [1]     673,500    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares) [2]     55,000    
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price (in dollars per share) [2]     $ 1.17    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period (in shares) [3]     102,500    
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price (in dollars per share) [3]     $ 3.47    
Shares Granted, Value, Share-Based Payment Arrangement, Forfeited     $ 16,880    
Executives and Key Personnel [Member]          
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) $ 1.74        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) 356,500        
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period (Year)   1 year      
Director [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) 277,500        
Employees [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) 19,500        
Consultant [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) 20,000        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 1 year        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period (in shares)     27,500    
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price (in dollars per share)     $ 1.75    
Key Personnel [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period (in shares)     75,000    
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price (in dollars per share)     $ 4.1    
Share-Based Payment Arrangement, Option [Member] | Executives and Key Personnel [Member] | Share-based Compensation Award Tranche Two through Five [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)   4 years      
Share-Based Payment Arrangement, Option [Member] | Director [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)   1 year      
Share-Based Payment Arrangement, Option [Member] | Minimum [Member] | Employees [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 4 years        
Stock Options 1 [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares)     25,000    
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price (in dollars per share)     $ 0.97    
Stock Options 2 [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares)     30,000    
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price (in dollars per share)     $ 1.33    
Restricted Stock Units (RSUs) [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) [4]     230,023    
Restricted Stock Units (RSUs) [Member] | Executives and Key Personnel [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 133,039     117,925  
Restricted Stock Units (RSUs) [Member] | Director [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 1 year        
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 96,984        
The 2021 Plan [Member]          
Common Stock, Capital Shares Reserved for Future Issuance (in shares)         3,000,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares)     6,304,597 5,788,597  
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number (in shares)     96,984 117,925  
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)     1,255,606 2,056,629  
The 2021 Plan [Member] | Share-Based Payment Arrangement, Option [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)     10 years    
The 2021 Plan [Member] | Share-Based Payment Arrangement, Option [Member] | Share-Based Payment Arrangement, Nonemployee [Member] | Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)     2 years    
The 2021 Plan [Member] | Share-Based Payment Arrangement, Option [Member] | Share-Based Payment Arrangement, Nonemployee [Member] | Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)     5 years    
[1] Represents the following options granted: • Annual share-based compensation awards on January 2, 2025, with an exercise price of $1.74, including: (a) 356,500 stock options granted to executives and key personnel, vesting upon one year anniversary, or annually in equal installments over four years, (b) 277,500 stock options granted to members of the Board of Directors, vesting upon one year anniversary, (c) 19,500 stock options granted to employees, vesting annually in equal installments over four years, and (d) 20,000 stock options granted to a consultant, vesting upon one year anniversary.
[2] Repre sents the following options exercised: (a) 25,000 stock options with an exercise price of $0.97 per share exercised by a board member (b) 30,000 stock options with an exercise price of $1.33 per share exercised by a board member.
[3] Represents the following options canceled: (a) 27,500 stock options with an exercise price of $1.75 per share granted to a consultant and (b) 75,000 stock option with an exercise price of $4.10 per share granted to key personnel.
[4] On January 2, 2025, the Company granted 96,984 restricted stock units, vesting upon one year anniversary, to the Board of Directors as a result of reduction in director cash compensation of 2025, and an aggregate of 133,039 restricted stock units, vested in full, to executives and key personnel in lieu of cash bonus earned for the year ended December 31, 2024.