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, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Balance sheet items, except for equity accounts	7.1268		7.1268		7.0827
Items in the statements of operations and comprehensive loss	7.1074	6.9806	7.1051	6.9291