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Note 11 - Employee Stock Plans (Details Textual) - shares
12 Months Ended
May 10, 2022
Apr. 24, 2019
Jan. 01, 2023
Jan. 02, 2022
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)     10 years  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)     4 years  
Stock Plan 2009 [Member]        
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)   10 years    
Stock Plan 2019 [Member]        
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) 522,000 357,000 960,000  
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized (in shares) 900,000   900,000 600,000
Stock Plan 2019 [Member] | Restricted Stock Units (RSUs) [Member] | Share-Based Payment Arrangement, Tranche One [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage     25.00%  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)     1 year  
The 2009 Employee Stock Purchase 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 Available for Grant (in shares)     206,000  
Share-based Compensation Arrangement by Share-based Payment Award, Offering Period (Month)     6 months  
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate     20.00%  
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares Per Employee (in shares)     1,429  
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date     85.00%