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Note 13 - Net Income (Loss) Per Share (Details Textual) - shares	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	64,000	75,000
Restricted Stock Units and Performance Share Award Target Level, Percentage	100.00%	100.00%	100.00%
Performance Shares [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	40,000	37,000

X

- Definition

Represents the target level percentage for restricted stock unit and performance share awards.

+ References

No definition available.

+ Details

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Namespace Prefix:	nwpx_
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Balance Type:	na
Period Type:	instant

X

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

+ Details

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Period Type:	duration

X

- Details

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