Note 2 - Variable Interest Entities - Consolidated VIEs' Assets and Liabilities (Details) - USD ($) $ in Thousands		Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019
Current assets:
Cash and cash equivalents		$ 1,555	$ 1,603	$ 1,600
Accounts receivable, net		3,070	3,260
Prepayment and deposit to suppliers		4,946	6,980
Due from related parties, net		51	81
Other current assets, net		831	11
Total current assets		10,453	11,935
Long-term investments		34	35
Operating lease right-of-use assets		9	12
Property and equipment, net		75	78
Intangible assets, net		1,698	1,899
Deferred tax assets, net		706	713
Total assets		18,494	18,551	$ 18,551
Current liabilities:
Short-term Bank Loans and Notes Payable	[1]		430
Accounts payable	[1]	257	408
Advances from customers	[1]	2,104	2,006
Accrued payroll and other accruals	[1]	524	491
Taxes payable	[1]	3,261	3,214
Lease payment liabilities related to short-term leases	[1]	170	136
Other current liabilities	[1]	442	221
Total current liabilities		6,819	7,013
Total Liabilities		6,943	7,138
Variable Interest Entity, Primary Beneficiary [Member]
Current assets:
Cash and cash equivalents		1,301	699
Accounts receivable, net		2,384	2,876
Prepayment and deposit to suppliers		2,302	3,998
Due from related parties, net		51	81
Other current assets, net		9	6
Total current assets		6,047	7,660
Long-term investments		34	35
Operating lease right-of-use assets		9	12
Property and equipment, net		39	40
Intangible assets, net		20	25
Deferred tax assets, net		706	713
Total assets		6,855	8,485
Current liabilities:
Short-term Bank Loans and Notes Payable			430
Accounts payable		257	408
Advances from customers		1,601	2,006
Accrued payroll and other accruals		86	132
Taxes payable		2,539	2,568
Lease payment liabilities related to short-term leases		39	19
Other current liabilities		112	84
Total current liabilities		4,634	5,647
Total Liabilities		$ 4,634	$ 5,647

[1] All of the VIEs' assets can be used to settle obligations of their primary beneficiary. Liabilities recognized as a result of consolidating these VIEs do not represent additional claims on the Company's general assets (Note 2).