Note 2 - Variable Interest Entities - Consolidated VIEs' Assets and Liabilities (Details) - USD ($)		Sep. 30, 2020		Dec. 31, 2019
Cash and cash equivalents *		$ 500,000	[1]	$ 1,603,000
Accounts receivable, net	[1]	2,282,000		3,260,000
Prepayment and deposit to suppliers	[1]	6,301,000		6,980,000
Due from related parties, net *	[1]	58,000		81,000
Other current assets, net	[1]	961,000		11,000
Total current assets		10,102,000		11,935,000
Long-term investments	[1]	64,000		35,000
Operating lease right-of-use assets *	[1]	4,000		12,000
Property and equipment, net *	[1]	74,000		78,000
Intangible assets, net	[1]	1,288,000		1,899,000
Deferred tax assets, net	[1]	815,000		713,000
Total assets		17,010,000		18,551,000
Short-term Bank Loans and Notes Payable	[1]			430,000
Accounts payable	[1]	552,000		408,000
Advance from customers	[1]	2,822,000		2,006,000
Accrued payroll and other accruals	[1]	442,000		491,000
Taxes payable	[1]	3,290,000		3,214,000
Lease payment liability related to a short-term lease	[1]	222,000		136,000
Other current liabilities	[1]	325,000		221,000
Total current liabilities		7,756,000		7,013,000
Total Liabilities		7,885,000		7,138,000
Variable Interest Entity, Primary Beneficiary [Member]
Cash and cash equivalents *		249,000		699,000
Accounts receivable, net		1,198,000		2,876,000
Prepayment and deposit to suppliers		4,176,000		3,998,000
Due from related parties, net *		58,000		81,000
Other current assets, net		9,000		6,000
Total current assets		5,690,000		7,660,000
Long-term investments		64,000		35,000
Operating lease right-of-use assets *		4,000		12,000
Property and equipment, net *		39,000		40,000
Intangible assets, net		13,000		25,000
Deferred tax assets, net		815,000		713,000
Total assets		6,625,000		8,485,000
Short-term Bank Loans and Notes Payable				430,000
Accounts payable		290,000		408,000
Advance from customers		2,553,000		2,006,000
Accrued payroll and other accruals		188,000		132,000
Taxes payable		2,632,000		2,568,000
Lease payment liability related to a short-term lease		52,000		19,000
Other current liabilities		157,000		84,000
Total current liabilities		5,872,000		5,647,000
Total Liabilities		$ 5,872,000		$ 5,647,000

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