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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 12 Months Ended
Mar. 31, 2020
Mar. 31, 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 465,665 $ 94,753 479,366
End of period $ 12,639,370   $ 771,805