Note 2 - Other Income, Net - Schedule of Components of Other Income, Net (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Net Realized and Unrealized Gain on Equity Securities	$ 88,738	$ 28,724
Gain on Asset Sales		1,215
Interest Income	132,527	53,617
Equity Earnings/(Losses) in Investees	(70,476)	1,485
Other Income	1,309	17,284
Interest and Other Expenses	(11,540)	(11,926)
Other Income, Net	$ 140,558	$ 90,399