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Note 5 - Lease Intangibles - Amortization Expense (Details) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
2021 $ 248,330  
2022 202,479  
2023 17,663  
2024 17,663  
2025 17,663  
Thereafter 13,266  
Total $ 517,064 $ 641,218