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Note 5 - Investment in Foreign Joint Venture (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Revenue from Contract with Customer, Excluding Assessed Tax	$ 17,309	$ 18,598	$ 34,647	$ 38,368
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		$ 65
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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Amount of accumulated statutory reserve under equity method investment.

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The sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings. This is called accretion if the security was purchased at a discount and amortization if it was purchased at premium. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations using the indirect method.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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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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