Note 15 - Concentration of Risk - Customer Concentration (Details) - Customer Concentration Risk [Member]	12 Months Ended
	Dec. 31, 2017		Dec. 31, 2016
Accounts Receivable [Member] | Customer A [Member]
Customer		[1]	11.00%
Accounts Receivable [Member] | Customer B [Member]
Customer	26.00%		15.00%
Accounts Receivable [Member] | Customer C [Member]
Customer		[1]	21.00%
Sales Revenue, Net [Member] | Customer B [Member]
Customer	19.00%		17.00%
Sales Revenue, Net [Member] | Customer C [Member]
Customer	10.00%		11.00%

[1] Customer's balance was below the 10% threshold for receivables as of December 31, 2017.