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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 ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Beginning of year $ 568,713 $ 952,128
Additional investment in unconsolidated affiliates 264,834 40,399
Distributions received (541,108) (816,201)
Loss on investment in affiliate (107,630)
Equity in income of unconsolidated affiliates 479,366 500,017
End of year $ 771,805 $ 568,713