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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+ Details

Investments in Foreign Joint Ventures - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Schedule of Equity Method Investments [Line Items]
Net sales	$ 9,019,000	$ 10,514,000	$ 27,860,000	$ 34,584,000
Affiliated Entity
Schedule of Equity Method Investments [Line Items]
Net sales			$ 0
Bomay
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	40.00%		40.00%
Bomay \| Baoji Oilfield Machinery Co., Ltd.
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	51.00%		51.00%
Bomay \| AA Energies, Inc.
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	9.00%		9.00%