Note 4 - Property, Plant, and Equipment (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment, Gross, Ending Balance	$ 14,527,400	$ 14,420,559
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Ending Balance	10,086,560	9,722,009
Depreciation, Total	$ 357,839	584,457
Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment, Current		560,000
Property, Plant and Equipment, Gross, Ending Balance		4,700,000
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Ending Balance		$ 4,140,000