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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, 2019	Mar. 31, 2018	Dec. 31, 2018
Beginning of period	$ 568,713	$ 952,128	$ 952,128
Additional investment in unconsolidated affiliate			40,399
Distributions received	(85,030)		(816,201)
Loss on investment in affiliate			(107,630)
Equity in income of unconsolidated affiliates	94,753	$ 283,662	500,017
End of period	$ 578,436		$ 568,713

X

- Definition

Amount of gain (loss) on sale or disposal of an equity method investment.

+ References

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- Definition

Amount of income (loss) for proportionate share of equity method investee's income (loss).

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The increase (decrease) during the reporting period in receivables to be collected from an entity that is controlling, under the control of, or within the same control group as the reporting entity by means of direct or indirect ownership.

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Amount of investment in equity method investee and investment in and advance to affiliate.

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The cash outflow associated with the acquisition of or advances to an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, and joint venture or equity method investment) or the acquisition of an additional interest in a subsidiary (controlled entity).

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