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Note 10 - Leases - Estimated Rental Commitments for Operating Leases (Details) - USD ($)
Mar. 31, 2021
Mar. 31, 2020
2021 (excluding three months) $ 164,000  
2022 222,000  
2023 222,000  
2024 227,000  
2025 212,000  
Thereafter 850,000  
Total minimum lease payments 1,897,000  
Discount effect of cash flows (387,000)  
Other Liabilities [Member]    
Present value of lease liabilities $ 1,510,000 $ 1,700,000