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Note 7 - Long-term investment (Details)
Dec. 31, 2024
USD ($)
Mar. 29, 2021
USD ($)
Mar. 29, 2021
CNY (¥)
Mar. 29, 2021
CNY (¥)
Haitianhuineng        
Equity Method Investments   $ 0.2    
Equity Method Investment, Ownership Percentage   4.56%   4.56%
Payments to Acquire Equity Method Investments   $ 0.2    
Haitianhuineng | RMB        
Equity Method Investments | ¥       ¥ 1.5
Payments to Acquire Equity Method Investments | ¥     ¥ 1.5  
Qingdao Tungray Intelligent Technology Co., Ltd        
Equity Method Investments $ 200,000      
Equity Method Investment, Ownership Percentage 100.00%      
Other than Temporary Impairment Losses, Investments $ 0