Note 11 - Concentrations - Accounts Receivable Concentrations (Details)	3 Months Ended		6 Months Ended			12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017		Jun. 30, 2016	Dec. 31, 2016
Percentage of accounts receivable	100.00%	100.00%	100.00%		100.00%
Customer A [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]
Percentage of accounts receivable			27.00%			16.00%	[1]
Customer B [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]
Percentage of accounts receivable			23.00%			6.00%
Customer C [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]
Percentage of accounts receivable			17.00%			6.00%
Customer D [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]
Percentage of accounts receivable				[1]		13.00%

[1] Less than 1% or none.