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Note 4 - Leases - Maturities of Lease Liabilities (Details) - USD ($)
Jul. 04, 2021
Dec. 31, 2020
Next 12 months, Operating Leases $ 1,484,000  
Next 12 months, Finance Leases 656,000  
12 to 24 months, Operating Leases 1,501,000  
12 to 24 months, Finance Leases 656,000  
24 to 36 months, Operating Leases 1,466,000  
24 to 36 months, Finance Leases 635,000  
36 to 48 months, Operating Leases 1,222,000  
36 to 48 months, Finance Leases 581,000  
48 to 60 months, Operating Leases 1,062,000  
48 to 60 months, Finance Leases 320,000  
Thereafter, Operating Leases 1,253,000  
Thereafter, Finance Leases 0  
Total lease payments, Operating Leases 7,988,000  
Total lease payments, Finance Leases 2,848,000  
Less imputed interest, Operating Leases (1,555,000)  
Less imputed interest, Finance Leases (574,000)  
Total, Operating Leases 6,433,000 $ 6,906,000
Total, Finance Leases $ 2,274,000