Note 4 - Summary of Significant Accounting Policies - Exchange Rates Used to Translate Amounts in RMB Into US$ (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Balance sheet items, except for equity accounts	7.2258		7.2258		6.9646
Items in the statements of operations and comprehensive loss	6.9806	6.6144	6.9291	6.4835