Note 7 - Other Current Assets, Net - Summary of Other Receivables (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Other receivables, gross	$ 1,765	$ 1,462
Allowance for doubtful accounts
Other receivables, net	1,765	1,462
Staff Advances for Business Operations [Member]
Other receivables, gross	9	18
Allowance for doubtful accounts
Other receivables, net	9	18
Loan to Unrelated Party [Member]
Other receivables, gross	1,756	1,444
Allowance for doubtful accounts
Other receivables, net	$ 1,756	$ 1,444