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Major Customers and International Sales (Tables)

12 Months Ended

Dec. 31, 2017

Segment Reporting [Abstract]

Summary of International Sales

International sales for 2017, 2016 and 2015 were as follows:

		2017				2016				2015
Asia		$	28,880			$	17,138			$	13,847
South and Central America			25,748				16,234				15,970
Mexico			16,030				16,690				17,096
Europe			10,700				14,519				12,350
Africa			7,893				7,111				8,622
Australia			4,334				3,735				4,158
Canada			4,083				3,690				1,585
Middle East			1,237				4,041				3,230
Other			—				101				437
		$	98,905			$	83,259			$	77,295

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- Definition

Tabular disclosure of the extent of the entity's reliance on its major customers, if revenues from transactions with a single external customer amount to 10 percent or more of entity revenues, including the disclosure of that fact, the total amount of revenues from each such customer, and the identity of the reportable segment or segments reporting the revenues. The entity need not disclose the identity of a major customer or the amount of revenues that each segment reports from that customer. For these purposes, a group of companies known to the entity to be under common control is considered a single customer, and the federal government, a state government, a local government such as a county or municipality, or a foreign government is each considered a single customer.

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