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Note 4 - Leases (Details Textual) - USD ($)
Jul. 04, 2021
Dec. 31, 2020
Lessee, Operating Lease, Renewal Term (Year) 5 years  
Operating Lease, Right-of-Use Asset $ 5,665,000 $ 6,103,000
Operating Lease, Liability, Total $ 6,433,000 $ 6,906,000
Minimum [Member]    
Lessee, Operating Lease, Term of Contract (Year) 10 years  
Maximum [Member]    
Lessee, Operating Lease, Term of Contract (Year) 11 years