Note 9 - Significant Customers / Concentration / Disaggregated Revenue - Net Sales by Geographical Region (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Net Sales	$ 7,421,198	$ 2,391,382
Reportable Geographical Components [Member] | US And Canada [Member]
Net Sales	113,059	109,225
Reportable Geographical Components [Member] | AUSTRALIA
Net Sales	62,113	200,303
Reportable Geographical Components [Member] | South America [Member]
Net Sales	319,528	3,428
Reportable Geographical Components [Member] | Asia [Member]
Net Sales	1,239,113	817,601
Reportable Geographical Components [Member] | Europe [Member]
Net Sales	$ 5,687,385	$ 1,260,825