Note 7 - Investments in Foreign Joint Ventures (Details Textual) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Aug. 20, 2019
Revenue from Contract with Customer, Excluding Assessed Tax	$ 73,114	$ 98,823
Equity Method Investment, Summarized Financial Information Accumulated Statutory Reserve	2,660
Accretion (Amortization) of Discounts and Premiums, Investments	129	129
Energia Superior Gas Natural LLC [Member]
Business Acquisition, Percentage of Voting Interests Acquired			50.00%
Affiliated Entity [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 0	$ 0
Bomay [Member]
Equity Method Investment, Ownership Percentage	40.00%	40.00%
Equity Method Investment, Remaining Life of Joint Venture (Year)	8 years
Bomay [Member] \| A A Energies Inc [Member]
Equity Method Investment, Ownership Percentage	9.00%
BOMAY Electric Industries Company, Ltd. [Member] \| Baoji Oilfield Machinery Co Ltd [Member] \| Bomay [Member]
Equity Method Investment, Ownership Percentage	51.00%

Remaining life of joint venture 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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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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