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Note 2 - Other Relevant Accounting Policies (Details Textual) - USD ($)
 1 Months Ended 12 Months Ended
Nov. 30, 2021
Jan. 02, 2022
Jan. 03, 2021
Dec. 29, 2019
Mar. 31, 2019
Operating Expenses, Denominated in Foreign Currency, Percent   21.00% 18.00% 19.00%  
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property   $ 5,000 $ (44,000) $ (4,000)  
Accounts Receivable, Allowance for Credit Loss, Ending Balance   62,000 0    
Operating and Finance Lease, Right of Use Asset   1,529,000 1,839,000   $ 975,000
Operating and Finance Lease Liability   1,563,000 1,882,000   $ 939,000
Goodwill, Ending Balance   185,000 185,000    
Goodwill, Impairment Loss   0      
Impairment of Intangible Assets, Finite-lived $ 0 0      
Deferred Tax Assets, Right-of-use Assets   400,000      
Deferred Tax Assets, Gross, Total   60,836,000 60,996,000    
Deferred Tax Assets, Valuation Allowance, Total   $ 60,353,000 60,486,000    
Number of suppliers   1      
Domestic Tax Authority [Member]          
Operating Loss Carryforwards, Subject to Expiration   $ 183,900,000      
Tax Credit Carryforward, Not Subject to Expiration       55,300,000  
Tax Credit Carryforward, Amount   3,700,000      
State and Local Jurisdiction [Member]          
Operating Loss Carryforwards, Subject to Expiration   94,400,000      
Tax Credit Carryforward, Amount   4,700,000      
Sensi ML [Member]          
Goodwill, Ending Balance       185,000  
Other Current Assets [Member]          
Operating Lease, Right-of-Use Asset   1,500,000      
Other Liabilities [Member]          
Operating Lease, Liability, Total   1,600,000      
Restructuring Charges [Member]          
Asset Impairment Charges, Total     35,000    
Restructuring Charges [Member] | INDIA          
Operating Lease, Impairment Loss     93,000    
Selling, General and Administrative Expenses [Member]          
Marketing and Advertising Expense, Total   $ 47,000 $ 76,000 $ 146,000  
Minimum [Member]          
Property, Plant and Equipment, Useful Life (Year)   1 year      
Minimum [Member] | Leasehold Improvements [Member]          
Property, Plant and Equipment, Useful Life (Year)   1 year      
Maximum [Member]          
Property, Plant and Equipment, Useful Life (Year)   7 years      
Finite-Lived Intangible Asset, Useful Life (Year)   5 years      
Maximum [Member] | Leasehold Improvements [Member]          
Property, Plant and Equipment, Useful Life (Year)   7 years