XML 39 R25.htm IDEA: XBRL DOCUMENT v3.20.1

Note 3 - Inventories (Tables)

3 Months Ended

Mar. 31, 2020

Notes Tables

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

		March 31, 2020				December 31, 2019
Raw materials		$	30,273			$	26,772
Work-in-process			2,261				1,579
Finished goods			5,097				683
Supplies			1,628				1,620
Total inventories		$	39,259			$	30,654

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