Note 7 - Other Receivables, Net - Summary of Other Receivables (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Other receivables, gross	$ 1,537	$ 728
Allowance for doubtful accounts	(706)	(717)
Other receivables, net	831	11
Staff Advances for Business Operations [Member]
Other receivables, gross	16	11
Allowance for doubtful accounts
Other receivables, net	16	11
Loan to Unrelated Party [Member]
Other receivables, gross	815
Allowance for doubtful accounts
Other receivables, net	815
Overdue Deposits [Member]
Other receivables, gross	706	717
Allowance for doubtful accounts	(706)	(717)
Other receivables, net