XML 25 R10.htm IDEA: XBRL DOCUMENT v3.8.0.1

Note 1 - Organization	12 Months Ended
	Dec. 31, 2017
Notes to Financial Statements
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	1. ORGANIZATION : Northwest Pipe Company (collectively with its subsidiaries, t he “Company”) operates in one business segment, Water Transmission, which primarily produces steel pipeline systems for use in drinking water infrastructure and has manufacturing facilities located in Portland, Oregon; Adelanto, California; Parkersburg, West Virginia; Saginaw, Texas; St. Louis, Missouri; Salt Lake City, Utah and Monterrey, Mexico.

X

- References

No definition available.

+ Details

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

X

- Definition

The entire disclosure for organization, consolidation and basis of presentation of financial statements disclosure.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-URI http://asc.fasb.org/topic&trid=2122149

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-URI http://asc.fasb.org/topic&trid=2197479

+ Details

Name:	us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration