Note 3 - Summary of Significant Accounting Policies - Contract liabilities (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($)
Balance as of January 1, 2019	$ 1,061
Exchange translation adjustment	(2)
Revenue recognized from beginning contract liability balances	(619)
Advances received from customers related to unsatisfied performance obligations	2,381
Balance as of June 30, 2019 (Unaudited)	2,821
--advance from customers	1,061
Unrelated Parties [Member]
Balance as of June 30, 2019 (Unaudited)	2,768
--advance from customers	2,768
Related Parties [Member]
Balance as of June 30, 2019 (Unaudited)	53
--advance from customers	$ 53