Note 7 - Other Current Assets - Summary of Other Receivables (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Other receivables, gross	$ 462	$ 1,462
Allowance for doubtful accounts	0	0
Other receivables, net	462	1,462
Staff Advances for Business Operations [Member]
Other receivables, gross	9	18
Allowance for doubtful accounts	0	0
Other receivables, net	9	18
Loan to Unrelated Party [Member]
Other receivables, gross	453	1,444
Allowance for doubtful accounts	0	0
Other receivables, net	$ 453	$ 1,444