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Note 7 - Investment in Foreign Joint Venture (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenue from Contract with Customer, Excluding Assessed Tax	$ 12,907	$ 23,150	$ 39,749	$ 43,417
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
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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Remaining life of joint venture under equity method investment.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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