Note 8 - Long-term Investments (Details Textual) ¥ in Thousands, $ in Thousands	Dec. 31, 2020 USD ($)	Dec. 31, 2020 CNY (¥)
Local Chain Xi’an [Member]
Equity Securities without Readily Determinable Fair Value, Amount	$ 40	¥ 250
Equity Securities without Readily Determinable Fair Value, Percent	4.90%	4.90%
Business Opportunity Chain [Member]
Equity Securities without Readily Determinable Fair Value, Amount	$ 30	¥ 190
Equity Securities without Readily Determinable Fair Value, Percent	19.00%	19.00%

Amount of investment in equity security without readily determinable fair value.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120269885&loc=SL75117539-209714

Name:	us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant