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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Balance sheet items, except for equity accounts	6.4601		6.4601		6.5249
Items in the statements of operations and comprehensive loss	6.4596	7.0839	6.4718	7.0319