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Note 6 - Investment in Foreign Joint Venture (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Revenue from Contract with Customer, Excluding Assessed Tax	$ 18,598	$ 12,907	$ 38,368	$ 39,749
Accretion (Amortization) of Discounts and Premiums, Investments			65	65
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
Equity Method Investment, Remaining Life of Joint Venture (Year)			9 years
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%

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