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Note 6 - Leases (Details Textual)
3 Months Ended 6 Months Ended
Jul. 04, 2021
USD ($)
Jun. 28, 2020
USD ($)
Jul. 04, 2021
USD ($)
Jun. 28, 2020
USD ($)
Jan. 03, 2021
USD ($)
Jul. 10, 2020
ft²
Operating and Finance Lease, Right of Use Asset $ 1,483,000   $ 1,483,000   $ 1,839,000  
Operating and Finance Lease Liability 1,558,000   1,558,000   $ 1,882,000  
Operating Lease, Expense $ 106,000 $ 158,000 $ 213,000 $ 305,000    
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