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Note 5 - Lease Intangibles - Amortization Expense (Details) - USD ($)
Jun. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Nine months remaining in 2020 $ 265,169    
2021 372,484 $ 687,974  
2022 202,479 510,215  
2023 17,663 360,116  
2024 17,663 173,785  
Thereafter 11,774    
Total $ 887,232 $ 2,105,011 $ 2,861,474