Note 2 - Variable Interest Entities - Consolidated VIEs' Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash and cash equivalents	$ 817	$ 4,391
Accounts receivable, net	844	1,745
Prepayment and deposit to suppliers	4,505	4,567
Other current assets	2,794	1,610
Total current assets	8,960	12,313
Long-term investments, net	794	1,596
Operating lease right-of-use assets	22	1,761	$ 1,760
Property and equipment, net	215	249
Deferred tax assets	401	406
Total Assets	11,233	19,658
Accounts payable	201	205
Advances from customers	843	739
Accrued payroll and other accruals	350	438
Taxes payable	3,194	3,248
Operating lease liabilities	24	347
Lease payment liabilities related to short-term leases	99	101
Other current liabilities	144	437
Total current liabilities	4,855	5,700
Operating lease liabilities-Non current	0	1,535
Total Liabilities	4,979	7,361
Variable Interest Entity, Primary Beneficiary [Member]
Cash and cash equivalents	367	578
Prepayment and deposit to suppliers	2,005	2,020
Other current assets	2	2
Total current assets	3,218	4,345
Long-term investments, net	0	165
Operating lease right-of-use assets	0	145
Property and equipment, net	139	113
Deferred tax assets	401	406
Total Assets	3,758	5,174
Accounts payable	201	205
Advances from customers	843	515
Accrued payroll and other accruals	37	63
Taxes payable	2,555	2,602
Operating lease liabilities	0	146
Lease payment liabilities related to short-term leases	99	101
Other current liabilities	56	320
Total current liabilities	3,791	3,952
Operating lease liabilities-Non current	0	0
Total Liabilities	3,791	3,952
Variable Interest Entity, Primary Beneficiary [Member] | Nonrelated Party [Member]
Accounts receivable, net	844	1,745
Variable Interest Entity, Primary Beneficiary [Member] | Related Party [Member]
Accounts receivable, net	$ 0	$ 0