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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Beginning of period     $ 568,713 $ 952,128 $ 952,128
Additional investment in unconsolidated affiliate       40,399
Distributions received     (203,382)   (816,201)
Loss on investment in affiliate       (107,630)
Equity in income of unconsolidated affiliates $ 69,016 $ 101,429 163,769 $ 385,091 500,017
End of period $ 529,100   $ 529,100   $ 568,713