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Note 4 - Inventories - Inventories (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Raw materials	$ 15,101	$ 14,586
Work-in-process	8,814	12,634
Finished goods	3,525	2,704
Inventory, Gross, Total	27,440	29,924
Less: Reserve for excess and obsolete inventory	(2,564)	(3,200)
Net inventories	$ 24,876	$ 26,724

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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Gross amount, as of the balance sheet date, of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.

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