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Note 2 - Leases - Maturities of Lease Liabilities (Details) - USD ($)
Dec. 31, 2021
Dec. 31, 2020
Next 12 months, Operating Leases $ 1,492,000  
Next 12 months, Finance Leases 1,315,000  
12 to 24 months, Operating Leases 1,509,000  
12 to 24 months, Finance Leases 1,315,000  
24 to 36 months, Operating Leases 1,318,000  
24 to 36 months, Finance Leases 1,238,000  
36 to 48 months, Operating Leases 1,231,000  
36 to 48 months, Finance Leases 1,173,000  
48 to 60 months, Operating Leases 858,000  
48 to 60 months, Finance Leases 262,000  
Thereafter, Operating Leases 842,000  
Thereafter, Finance Leases 0  
Total lease payments, Operating Leases 7,250,000  
Total payments, equipment finance lease 5,303,000  
Less imputed interest, Operating Leases (1,309,000)  
Less imputed interest, equipment finance lease (851,000)  
Total, Operating Leases 5,941,000 $ 6,906,000
Total equipment financing obligations, equipment lease finance $ 4,452,000