XML 48 R23.htm IDEA: XBRL DOCUMENT v3.2.0.727

Note 3 - Inventories (Tables)

6 Months Ended

Jun. 30, 2015

Notes Tables

Schedule Of Inventory Current And Non Current [Table Text Block]

		June 30, 2015				December 31, 2014
Short-term inventories:
Raw materials		$	36,941			$	48,005
Work-in-process			1,618				1,741
Finished goods			10,244				20,663
Supplies			2,348				2,370
Total short-term inventories			51,151				72,779
Long-term inventories:
Finished goods			912				1,214
Total inventories		$	52,063			$	73,993

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

- References

No definition available.

+ Details

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