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Note 7 - Leases (Details Textual)
$ in Millions
12 Months Ended
Jan. 01, 2023
USD ($)
Jan. 02, 2022
USD ($)
Jan. 03, 2021
USD ($)
Apr. 30, 2019
ft²
Feb. 28, 2019
ft²
Operating Lease, Expense | $ $ 0.4 $ 0.4 $ 0.5    
Office In California [Member]          
Lessee, Operating Lease, Term of Contract (Year)         5 years
Area of Real Estate Property (Square Foot)         24,164
Beaverton Oregon [Member]          
Lessee, Operating Lease, Term of Contract (Year)       4 years  
Area of Real Estate Property (Square Foot)       705  
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