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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 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Beginning of period     $ 771,805 $ 568,713 $ 568,713
Additional investment in unconsolidated affiliates     13,175,000   264,834
Distributions received     (326,144)   (541,108)
Equity in income of unconsolidated affiliates $ 1,342,826 $ 159,564 2,406,151 $ 323,333 479,366
End of period $ 16,026,812   $ 16,026,812   $ 771,805