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Note 8 - Leases (Details Textual)
12 Months Ended
Jan. 03, 2021
USD ($)
ft²
Dec. 29, 2019
USD ($)
Dec. 30, 2018
USD ($)
Jul. 10, 2020
ft²
Feb. 13, 2019
ft²
Operating and Finance Lease, Right of Use Asset | $ $ 1,839,000 $ 2,370,000      
Operating and Finance Lease Liability | $ 1,882,000 2,287,000      
Operating Lease, Expense | $ $ 493,000 $ 798,000 $ 881,000    
Office In California [Member]          
Lessee, Operating Lease, Term of Contract (Year)         5 years
Area of Land (Square Foot) | ft²         24,164
Office in India [Member]          
Lessee, Operating Lease, Term of Contract (Year)       11 years  
Area of Real Estate Property (Square Foot) | ft² 9,400        
Office Premises in India [Member]          
Area of Real Estate Property (Square Foot) | ft²       1,100  
Minimum [Member]          
Lessee, Operating Lease, Term of Contract (Year) 1 year        
Lessee, Finance Lease, Term of Contract (Year) 2 years        
Maximum [Member]          
Lessee, Operating Lease, Term of Contract (Year) 5 years        
Lessee, Finance Lease, Term of Contract (Year) 3 years