XML 36 R23.htm IDEA: XBRL DOCUMENT v3.5.0.2

Note 2 - Inventories (Tables)

9 Months Ended

Sep. 30, 2016

Notes Tables

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

		September 30, 2016				December 31, 2015
Short-term inventories:
Raw materials		$	16,859			$	21,486
Work-in-process			870				1,901
Finished goods			515				3,641
Supplies			2,362				2,447
Total short-term inventories			20,606				29,475
Long-term inventories:
Finished goods			761				823
Total inventories		$	21,367			$	30,298

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