Note 3 - Summary of Significant Accounting Policies - Exchange Rates Used to Translate Amounts In RMB Into US$ (Details)	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Items in the statements of operations and comprehensive loss, and statements of cash flows	6.8137	6.3789	6.7808	6.3711
Balance Sheet Items, Except Equity Accounts [Member]
Balance sheet items, except for equity accounts	6.8747		6.8747		6.8632

Foreign exchange rate used to translate amounts denominated in functional currency to reporting currency.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 30
-Section S99
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6897108&loc=SL6897125-166521

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