Note 10 - Concentrations - Customers Representing 5% or More of Total Revenue (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Revenue by customer	$ 1,194,763	$ 1,144,585
Major Customers 1 [Member]
Revenue by customer	254,018	179,292
Major Customers 2 [Member]
Revenue by customer	156,854	163,483
Major Customers 3 [Member]
Revenue by customer	93,575	131,837
Major Customers 4 [Member]
Revenue by customer	93,563	113,280
Major Customers 5 [Member]
Revenue by customer		70,760
Major Customers 6 [Member]
Revenue by customer		61,677
Major Customers 7 [Member]
Revenue by customer		$ 51,814