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Note 15 - Commitments - Maturities of Lease Liabilities (Details) - USD ($)
Dec. 31, 2021
Dec. 31, 2020
2022, operating $ 169,000  
2022, finance 385,000  
2023, operating 169,000  
2023, finance 385,000  
2024, operating 169,000  
2024, finance 385,000  
2025, operating 169,000  
2025, finance 385,000  
2026, operating 134,000  
2026, finance 389,000  
2026 and thereafter, operating 122,000  
2026 and thereafter, finance 3,726,000  
Total undiscounted cash flows, operating 932,000  
Total undiscounted cash flows, finance 5,655,000  
Impact of present value discount, operating (54,000)  
Impact of present value discount, finance (1,002,000)  
Finance Lease, Liability, Total 4,653,000  
Accrued Interest Payable and Other Liabilities [Member]    
Operating Lease, Liability, Total $ 878,000 $ 746,000