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Note 8 - Shareholder Rights Plan (Details Textual) - $ / shares	Jun. 18, 2009	Sep. 30, 2019
Number of Series Junior Participating Preferred Stock Shares Reserved		150,000
Dividend Distribution Under Shareholder Rights Plan		1
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right		0.01
Purchase Price Under Rights		$ 83
Acquisition Percentage		15.00%
Value of Exercised Right		2
Right Redemption Value		$ 0.01
Amended and Restated Rights Agreement Expiration Date	Jun. 28, 2019

X

- Definition

Percentage of Company's outstanding shares of common stock which person or group must acquire or commence a tender offer to acquire to cause Rights to become exercisable.

+ References

No definition available.

+ Details

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Namespace Prefix:	nwpx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the amended and restated rights agreement expiration date

+ References

No definition available.

+ Details

Name:	nwpx_AmendedAndRestatedRightsAgreementExpirationDate
Namespace Prefix:	nwpx_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the number of non-detachable preferred stock purchase rights per share of common stock.

+ References

No definition available.

+ Details

Name:	nwpx_DividendDistributionUnderShareholderRightsPlan
Namespace Prefix:	nwpx_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of Series A Junior Participating Preferred Stock Shares reserved under the Shareholder Rights Plan.

+ References

No definition available.

+ Details

Name:	nwpx_NumberOfSeriesJuniorParticipatingPreferredStockSharesReserved
Namespace Prefix:	nwpx_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Price at which shareholders holding a Right may purchase 1/100th of a share of preferred stock under the Shareholder Rights Plan.

+ References

No definition available.

+ Details

Name:	nwpx_PurchasePriceUnderRights
Namespace Prefix:	nwpx_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Under certain circumstances, the value at which the Company may redeem the right.

+ References

No definition available.

+ Details

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Namespace Prefix:	nwpx_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

If exercised, the value of common stock of the Company or an acquiring company a Right holder may purchase. This amount is equal to two times the exercise price of the Right.

+ References

No definition available.

+ Details

Name:	nwpx_ValueOfExercisedRight
Namespace Prefix:	nwpx_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares.

+ References

No definition available.

+ Details

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