Note 23 - Concentration of Risk (Details Textual)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Number of Customers	2	1	2	1
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Customer 1 [Member]
Concentration Risk, Percentage	19.00%		14.00%	21.00%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Customer 2 [Member]
Concentration Risk, Percentage	11.00%		14.00%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | One Customer [Member]
Concentration Risk, Percentage		21.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member]
Number of Customers			3		2
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer 1 [Member]
Concentration Risk, Percentage			54.00%		30.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer 2 [Member]
Concentration Risk, Percentage			16.00%		16.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer 3 [Member]
Concentration Risk, Percentage			11.00%		20.00%
Cost Of Sales Total [Member] | Supplier Concentration Risk [Member]
Number of Suppliers	2	2	2	2
Cost Of Sales Total [Member] | Supplier Concentration Risk [Member] | Supplier 1 [Member]
Concentration Risk, Percentage	87.00%	81.00%	83.00%	75.00%
Cost Of Sales Total [Member] | Supplier Concentration Risk [Member] | Supplier 2 [Member]
Concentration Risk, Percentage	10.00%	11.00%	13.00%	16.00%
CHINA
Percent of Cash and Cash Equivalents Held by Major Financial Institutions	43.00%		43.00%
UNITED STATES
Percent of Cash and Cash Equivalents Held by Major Financial Institutions	57.00%		57.00%