Note 15 - Concentration of Risk (Details Textual) - Customer Concentration Risk [Member]	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Sales Revenue, Goods, Net [Member]
Concentration Risk Threshold Percentage	10.00%
Sales Revenue, Net [Member]
Concentration Risk Threshold Percentage		10.00%
Accounts Receivable [Member]
Concentration Risk Threshold Percentage	10.00%	10.00%