XML 42 R30.htm IDEA: XBRL DOCUMENT
v3.24.3

Note H - Employee Benefit Plans (Tables) | 12 Months Ended
--- | ---
Jun. 30, 2024
Notes Tables |
Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan [Table Text Block] |
|  | 2024 |  |  | 2023 |
Change in Benefit Obligation: |  |  |  |  |  |  |  |
Benefit obligation at beginning of year |  | $ | 1,364 |  |  | $ | 1,438 |
Interest cost |  |  | 49 |  |  |  | 46 |
Actuarial loss |  |  | (39 | ) |  |  | (29 | )
Benefits paid |  |  | — |  |  |  | (91 | )
Benefit obligation at end of year |  | $ | 1,374 |  |  | $ | 1,364 |
Change in Plan Assets: |  |  |  |  |  |  |  |
Fair value of plan assets at beginning of year |  | $ | 1,025 |  |  | $ | 1,094 |
Actual return on plan assets |  |  | 91 |  |  |  | 22 |
Employer contributions |  |  | 116 |  |  |  | — |
Benefits paid |  |  | — |  |  |  | (91 | )
Fair value of plan assets at end of year |  | $ | 1,232 |  |  | $ | 1,025 |
Reconciliation of Funded Status: |  |  |  |  |  |  |  |
Difference between benefit obligation and fair value of plan assets |  | $ | (142 | ) |  | $ | (339 | )
Unrecognized net actuarial loss in accumulated other comprehensive income |  |  | 282 |  |  |  | 409 |
Net amount recognized |  | $ | 140 |  |  | $ | 70 |
Projected benefit obligation |  | $ | 1,374 |  |  | $ | 1,364 |
Accumulated benefit obligation |  | $ | 1,374 |  |  | $ | 1,364 |
Fair value of plan assets |  | $ | 1,232 |  |  | $ | 1,025 |
Schedule of Net Benefit Costs [Table Text Block] |
|  | 2024 |  |  | 2023 |
Interest cost |  | $ | 49 |  |  | $ | 46 |
Expected return on plan assets |  |  | (42 | ) |  |  | (42 | )
Recognized actuarial loss |  |  | 39 |  |  |  | 50 |
Settlement loss |  |  | - |  |  |  | 27 |
Net periodic benefit expense |  | $ | 46 |  |  | $ | 81 |
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] |
|  | 2024 |  |  | 2023 |
Net loss |  | $ | (88 | ) |  | $ | (8 | )
Settlement loss |  |  | — |  |  |  | (28 | )
Amortization of net loss |  |  | (39 | ) |  |  | (50 | )
Total recognized in other comprehensive loss |  | $ | (127 | ) |  | $ | (86 | )
Total recognized in net periodic benefit cost and other comprehensive loss |  | $ | (81 | ) |  | $ | (5 | )
Schedule of Expected Benefit Payments [Table Text Block] |
2025 |  | $ | 1,009 |
2026 |  |  | 13 |
2027 |  |  | 101 |
2028 |  |  | 29 |
2029 |  |  | 32 |
2030-2034 |  |  | 199 |
Total benefit payments expected to be paid |  | $ | 1,383 |
Defined Benefit Plan, Assumptions [Table Text Block] |
|  | 2024 |  |  | 2023 |
Discount rate |  |  | 5.28 | % |  |  | 4.89 | %
Expected long-term rate of return |  |  | 6.70 | % |  |  | 6.24 | %
Compensation increase rate |  |  | N/A |  |  |  | N/A |
Schedule of Weighted Average Allocation of Assets Related to Defined Benefit Plans Disclosure [Table Text Block] |
|  |  |  |  |  |  |  |  |  | Target |
|  | 2024 |  |  | 2023 |  |  | Allocation |
Equity securities |  |  | 72 | % |  |  | 64 | % |  |  | 53 | %
Debt securities |  |  | 14 | % |  |  | 14 | % |  |  | 41 | %
Commodities |  |  | 0 | % |  |  | 12 | % |  |  | 4 | %
Cash alternatives |  |  | 14 | % |  |  | 10 | % |  |  | 2 | %
|  |  | 100 | % |  |  | 100 | % |  |  | 100 | %
Schedule of Allocation of Plan Assets [Table Text Block] |
|  |  |  |  |  | Quoted |  |  |  |  |  |  |  |  |
|  |  |  |  |  | Prices in |  |  |  |  |  |  |  |  |
|  |  |  |  |  | Active |  |  |  |  |  |  |  |  |
|  |  |  |  |  | Markets for |  |  | Significant |  |  | Significant |
|  |  |  |  |  | Identical |  |  | Observable |  |  | Unobservable |
|  |  |  |  |  | Assets |  |  | Inputs |  |  | Inputs |
|  | Total |  |  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |
Equity securities(1) |  | $ | 889 |  |  | $ | 889 |  |  | $ | — |  |  | $ | — |
Debt securities(2) |  | $ | 173 |  |  | $ | 173 |  |  | $ | — |  |  | $ | — |
Cash alternatives(3) |  | $ | 170 |  |  | $ | 170 |  |  | $ | — |  |  | $ | — |
Total |  | $ | 1,232 |  |  | $ | 1,232 |  |  | $ | — |  |  | $ | — |

X
- Definition Tabular disclosure of the weighted-average asset allocation related to defined benefit plans. + References No definition available. + Details
Name: | naii_ScheduleOfWeightedAverageAllocationOfAssetsRelatedToDefinedBenefitPlansDisclosureTableTextBlock
Namespace Prefix: | naii_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the change in the benefit obligation, fair value of plan assets, and funded status of pension plans or other employee benefit plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Subparagraph (a)(b)(c) -Paragraph 1 -SubTopic 20 -Topic 715 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
Name: | us-gaap_ChangesInProjectedBenefitObligationsFairValueOfPlanAssetsAndFundedStatusOfPlanTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (d)(5) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
Name: | us-gaap_ScheduleOfAllocationOfPlanAssetsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the net gain (loss) and net prior service cost or credit recognized in other comprehensive income (loss) for the period for pension plans and/or other employee benefit plans, and reclassification adjustments of other comprehensive income (loss) for the period, as those amounts, including amortization of the net transition asset or obligation, are recognized as components of net periodic benefit cost. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
Name: | us-gaap_ScheduleOfAmountsRecognizedInOtherComprehensiveIncomeLossTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of assumption used to determine benefit obligation and net periodic benefit cost of defined benefit plan. Includes, but is not limited to, discount rate, rate of compensation increase, expected long-term rate of return on plan assets and interest crediting rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
Name: | us-gaap_ScheduleOfAssumptionsUsedTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (f) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
Name: | us-gaap_ScheduleOfExpectedBenefitPaymentsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (h) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
Name: | us-gaap_ScheduleOfNetBenefitCostsTableTextBlock
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