Annual report [Section 13 and 15(d), not S-K Item 405]

Note 2 - Significant Accounting Policies (Details Textual)

v3.25.1
Note 2 - Significant Accounting Policies (Details Textual)
$ in Thousands
12 Months Ended
Jan. 02, 2025
shares
Jan. 02, 2024
shares
Jan. 01, 2023
shares
Sep. 30, 2016
shares
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Number of Reportable Segments         1    
Number of Operating Segments         1    
Stock Issued During Period, Shares, New Issues (in shares)       250,000      
Preferred Stock, Dividend Rate, Percentage       2.50%      
Common Stock Dividends, Shares (in shares)   22,476 3,085        
Common Stock Dividends, Shares, Percentage Of Fully Diluted Outstanding Equity   2.50%          
Research And Development Expense, Licenses Acquired | $         $ 200 $ 300 $ 300
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued | $         $ 0 $ 0  
Share-Based Payment Arrangement, Option [Member]              
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)         4 years    
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)         10 years    
Subsequent Event [Member]              
Common Stock Dividends, Shares (in shares) 101,935            
Common Stock Dividends, Shares, Percentage Of Fully Diluted Outstanding Equity 2.50%