XML 57 R19.htm IDEA: XBRL DOCUMENT v2.4.0.8

Inventories (Tables)

9 Months Ended

Sep. 30, 2013

Inventory Disclosure [Abstract]

Components of Inventories

Inventories are stated at the lower of cost or market and consist of the following (in thousands):

		September 30, 2013				December 31, 2012
Short-term inventories:
Raw materials		$	45,624			$	56,913
Work-in-process			1,187				10,157
Finished goods			60,014				43,374
Supplies			3,120				3,101
			109,945				113,545
Long-term inventories:
Finished goods			1,306				1,608
Total inventories		$	111,251			$	115,153

X

- Definition

Tabular disclosure of the carrying 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. Includes current and non-current inventory balances.

+ References

No definition available.

+ Details

Name:	nwpx_ScheduleOfInventoryCurrentAndNonCurrentTableTextBlock
Namespace Prefix:	nwpx_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_InventoryDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration