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Note 5 - Lease Intangibles - Amortization Expense 1 (Details) - USD ($)
Jun. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
2020 $ 372,484 $ 687,974  
2021 202,479 510,215  
2022 17,663 360,116  
2023 17,663 173,785  
2024   118,989  
Thereafter   253,932  
Total $ 887,232 $ 2,105,011 $ 2,861,474