XML 38 R27.htm IDEA: XBRL DOCUMENT
v3.22.1

Note 10 - Accumulated Other Comprehensive Loss (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2022
Notes Tables |
Schedule of Changes in Accumulated Other Comprehensive Income Loss [Table Text Block] |
|  | Pension Liability Ad justment |  |  | Unrealized Loss o n Cash Flow He dges |  |  | Total |
Balance, December 31, 2021 |  | $ | (1,487 | ) |  | $ | (195 | ) |  | $ | (1,682 | )
Other comprehensive income (loss) before reclassifications |  |  | 20 |  |  |  | (296 | ) |  |  | (276 | )
Amounts reclassified from Accumulated other comprehensive loss |  |  | 2 |  |  |  | (11 | ) |  |  | (9 | )
Net current period other comprehensive income (loss) |  |  | 22 |  |  |  | (307 | ) |  |  | (285 | )
Balance, March 31, 2022 |  | $ | (1,465 | ) |  | $ | (502 | ) |  | $ | (1,967 | )
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] |
|  | Amount reclassified from Acc umulated Other Co mprehensive Loss |  | Affected line item in the Co ndensed Consolidated St atements of Operations
Details about Accumulated Other Comprehensive Loss Components |  | Three Months Ended March 31, |
| 2022 |  |  | 2021 |
Pension liability adjustment: |  |  |  |  |  |  |  |  |
Net periodic pension cost: |  |  |  |  |  |  |  |  |
Service cost |  | $ | (2 | ) |  | $ | (4 | ) | Cost of sales
|  |  | (2 | ) |  |  | (4 | ) | Net of tax
Unrealized gain (loss) on cash flow hedges: |  |  |  |  |  |  |  |  |
Gain (loss) on cash flow hedges |  |  | 14 |  |  |  | (36 | ) | Net sales
Associated income tax (expense) benefit |  |  | (3 | ) |  |  | 9 |  | Income tax expense
|  |  | 11 |  |  |  | (27 | ) | Net of tax
Total reclassifications for the period |  | $ | 9 |  |  | $ | (31 | ) |

X
- Definition Represents schedule of changes in accumulated other comprehensive income loss. + References No definition available. + Details
Name: | nwpx_ScheduleOfChangesInAccumulatedOtherComprehensiveIncomeLossTableTextBlock
Namespace Prefix: | nwpx_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss). + References No definition available. + Details
Name: | us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types: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