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Note 8 - Investments, Including Investments Accounted for Using the Equity Method - Reconciliation of the Company's Investments in Equity Affiliates (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Beginning of period     $ 771,805 $ 568,713 $ 568,713
Additional investment in unconsolidated affiliates     11,500,000   264,834
Distributions received     (98,100)   (541,108)
Equity in income of unconsolidated affiliates $ 597,660 $ 69,016 1,063,325 $ 163,769 479,366
End of period $ 13,237,030   $ 13,237,030   $ 771,805