4. Inventories, net
Inventories consisted of the following at December 31, (in thousands):
| 2012 | 2011 | |||||||
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Raw materials and supplies |
$ | 25,124 | $ | 21,341 | ||||
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Work-in-process |
8,449 | 6,801 | ||||||
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Finished goods |
116 | 113 | ||||||
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Excess and obsolete reserve |
(1,978 | ) | (1,698 | ) | ||||
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Total inventories |
$ | 31,711 | $ | 26,557 | ||||
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For the years ended December 31, 2012 and 2010, the Company recognized expense of $0.3 million and $0.7 million, respectively, in operating costs for excess and obsolete inventory. Amounts expensed for excess and obsolete inventory were not significant for the year ended December 31, 2011.