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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Beginning of period     $ 568,713 $ 952,128 $ 952,128
Additional investment in unconsolidated affiliate     225,978 40,399 40,399
Distributions received     (503,431)   (816,201)
Loss on investment in affiliate       (107,630)
Equity in income of unconsolidated affiliates $ 159,564 $ 117,395 323,333 $ 502,486 500,017
End of period $ 614,593   $ 614,593   $ 568,713