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Note 5 - Investment in Foreign Joint Venture (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Revenue from Contract with Customer, Excluding Assessed Tax $ 20,325 $ 17,627 $ 54,972 $ 55,995  
Affiliated Entity [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax $ 0 0 $ 0 0  
Bomay [Member]          
Equity Method Investment, Ownership Percentage 40.00%   40.00%    
Equity Method Investment, Summarized Financial Information Accumulated Statutory Reserve $ 2,700   $ 2,700   $ 2,700
Accretion (Amortization) of Discounts and Premiums, Investments $ 32 $ 32 $ 97 $ 97  
Bomay [Member] | Baoji Oilfield Machinery Co Ltd [Member]          
Equity Method Investment, Ownership Percentage 51.00%   51.00%    
Bomay [Member] | A A Energies Inc [Member]          
Equity Method Investment, Ownership Percentage 9.00%   9.00%