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Note 6 - Leases (Details Textual)
3 Months Ended 9 Months Ended
Jul. 10, 2020
USD ($)
ft²
Oct. 03, 2021
USD ($)
Sep. 27, 2020
USD ($)
Oct. 03, 2021
USD ($)
Sep. 27, 2020
USD ($)
Jan. 03, 2021
USD ($)
Operating and Finance Lease, Right of Use Asset   $ 1,722,000   $ 1,722,000   $ 1,839,000
Operating and Finance Lease Liability   1,796,000   1,796,000   $ 1,882,000
Operating Lease, Expense   $ 105,000 $ 150,000 $ 319,000 $ 455,000  
Restructuring Charges [Member]            
Operating Lease, Expense $ 39,000          
Office Premises in India [Member]            
Area of Real Estate Property (Square Foot) | ft² 1,100          
Office in India [Member]            
Lessee, Operating Lease, Term of Contract (Year) 11 months          
Minimum [Member]            
Lessee, Operating Lease, Term of Contract (Year)   1 year   1 year    
Lessee, Finance Lease, Term of Contract (Year)   2 years   2 years    
Maximum [Member]            
Lessee, Operating Lease, Term of Contract (Year)   5 years   5 years    
Lessee, Finance Lease, Term of Contract (Year)   3 years   3 years