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Note 3 - Discontinued Operations - Schedule of Income Statement Information From Discontinued Operations (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 28, 2025
Sep. 29, 2024
Jun. 30, 2024
Sep. 28, 2025
Sep. 29, 2024
Dec. 29, 2024
Basic (in dollars per share) $ (0.24) $ (0.14)   $ (0.56) $ (0.25)  
Diluted (in dollars per share) $ (0.24) $ (0.14)   $ (0.56) $ (0.25)  
Basic (in shares) 16,516 14,555   15,957 14,390  
Diluted (in shares) 16,516 14,555   15,957 14,390  
Sensi ML [Member] | Discontinued Operations [Member]            
Revenue $ 0 $ 64   $ 11 $ 433  
Cost of revenue 0 167   3 494  
Gross profit (loss) 0 (103)   8 (61)  
Research and development 3 156   21 474  
Selling, general and administrative 0 0   13 0  
Restructuring costs 0 0   87 0  
Interest income and other income (expense), net 0 (7)   0 (17)  
Income (loss) from discontinued operations before income taxes (3) (266)   (113) (552)  
(Benefit from) provision for income taxes 0 0   0 0  
Net income (loss) from discontinued operations $ (3) $ (266)   $ (113) $ (552)  
Basic (in dollars per share) $ (0) $ (0.02)   $ (0.01) $ (0.04)  
Diluted (in dollars per share) $ (0) $ (0.02)   $ (0.01) $ (0.04)  
Basic (in shares) 16,516 14,555   15,957 14,390  
Diluted (in shares) 16,516 14,555   15,957 14,390  
Fixed $ 0 $ 4   $ 4 $ 12  
Total 0 4   4 12  
Disposal Group, Including Discontinued Operation, Share-based Payment Arrangement Expense 0 (105)   (32) 147  
Net cash provided by (used in) operating activities from discontinued operations     $ 115 (200)    
Net cash provided by (used in) investing activities from discontinued operations     (463) 0    
Net cash provided by (used in) financing activities from discontinued operations     $ 330 182    
Sensi ML [Member] | Discontinued Operations [Member] | Cost of Sales [Member]            
Disposal Group, Including Discontinued Operation, Share-based Payment Arrangement Expense 0 0   0 0  
Sensi ML [Member] | Discontinued Operations [Member] | Research and Development Expense [Member]            
Disposal Group, Including Discontinued Operation, Share-based Payment Arrangement Expense 0 (105)   (32) 147  
Sensi ML [Member] | Discontinued Operations [Member] | Selling, General and Administrative Expenses [Member]            
Disposal Group, Including Discontinued Operation, Share-based Payment Arrangement Expense 0 $ 0   $ 0 $ 0  
Sensi ML [Member] | Discontinued Operations [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer "L" [Member]            
Concentration percentage       34.00%   34.00%
Sensi ML [Member] | Discontinued Operations [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer "M" [Member]            
Concentration percentage       65.00%   65.00%
Sensi ML [Member] | Discontinued Operations [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Customer "L" [Member]            
Concentration percentage       50.00% 84.00%  
Sensi ML [Member] | Discontinued Operations [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Customer "O" [Member]            
Concentration percentage       34.00%    
Sensi ML [Member] | Discontinued Operations [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Customer "R" [Member]            
Concentration percentage   55.00%        
Sensi ML [Member] | Discontinued Operations [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Customer "S" [Member]            
Concentration percentage   20.00%        
Sensi ML [Member] | Discontinued Operations [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Customer "T" [Member]            
Concentration percentage   11.00%        
Sensi ML [Member] | Discontinued Operations [Member] | Asia Pacific [Member]            
Revenue 0 $ 10   $ 4 $ 19  
Sensi ML [Member] | Discontinued Operations [Member] | North America [Member]            
Revenue 0 54   6 414  
Sensi ML [Member] | Discontinued Operations [Member] | Europe [Member]            
Revenue 0 0   1 0  
Sensi ML [Member] | New Products [Member] | Discontinued Operations [Member]            
Revenue $ 0 $ 64   $ 11 $ 433