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Inventories (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Inventories
Raw materials	$ 23,554,000	$ 17,485,000
Work in process	20,135,000	20,410,000
Finished goods	2,151,000	2,257,000
Inventories, total	45,840,000	40,152,000
Inventory reserve	13,300,000	12,000,000
Excess and obsolete inventory	$ 291,000	$ 254,000

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- Definition

Represents the amount of excess and obsolete inventory.

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- Definition

Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
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-Subparagraph (SX 210.5-02(6)(a)(1))
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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of unprocessed items to be consumed in the manufacturing or production process.

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Amount of valuation reserve for inventory.

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Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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