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Note 5 - Lease Intangibles - Amortization Expense (Details) - USD ($)
Sep. 30, 2021
Dec. 31, 2020
2021 $ 52,866  
2022 202,342  
2023 17,526  
2024 17,526  
2025 15,670  
Thereafter 4,107  
Total $ 310,037 $ 641,218