Note 13 - Concentration (Details Textual)		3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017	Jun. 30, 2018 USD ($)	Jun. 30, 2017	Dec. 31, 2017 USD ($)
Accounts Receivable, Gross	$ 3,926,759	$ 3,926,759		$ 3,926,759		$ 2,555,476
Sales Revenue, Goods, Net [Member] | Customer Concentration Risk [Member]
Number of Customers		1	2	1	2
Sales Revenue, Goods, Net [Member] | Customer Concentration Risk [Member] | One Customer [Member]
Concentration Risk, Percentage				43.00%
Sales Revenue, Goods, Net [Member] | Customer Concentration Risk [Member] | Two Customers [Member]
Concentration Risk, Percentage			69.00%		75.00%
Sales Revenue, Goods, Net [Member] | Customer Concentration Risk [Member] | Customer One [Member]
Concentration Risk, Percentage			55.00%		53.00%
Sales Revenue, Goods, Net [Member] | Customer Concentration Risk [Member] | Customer Two [Member]
Concentration Risk, Percentage			14.00%		22.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member]
Concentration Risk, Percentage	84.00%					78.00%