Note 8 - Concentrations - Customers Representing 5% or More of Total Revenue (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Major Customers 1 [Member]
Revenue by customer	$ 41,686	$ 30,322
Major Customers 2 [Member]
Revenue by customer	38,333	19,674
Major Customers 3 [Member]
Revenue by customer	15,651	16,644
Major Customers 4 [Member]
Revenue by customer	14,307	16,458
Major Customers 5 [Member]
Revenue by customer	$ 14,172	$ 10,562