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Note F - Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2016
Notes Tables |
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] |
|  | 2016 |  |  | 2015 |  |  | 2014 |
United States |  | $ | 33,101 |  |  | $ | 35,391 |  |  | $ | 49,692 |
Foreign countries |  |  | 3,381 |  |  |  | 1,875 |  |  |  | 4,042 |
Total |  | $ | 36,482 |  |  | $ | 37,266 |  |  | $ | 53,734 |
|  | 2016 |  |  | 2015 |  |  | 2014 |
Current expense: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  | $ | 6,960 |  |  | $ | 11,465 |  |  | $ | 16,638 |
Foreign |  |  | 547 |  |  |  | 292 |  |  |  | 946 |
State and local |  |  | 581 |  |  |  | 963 |  |  |  | 1,376 |
|  |  | 8,088 |  |  |  | 12,720 |  |  |  | 18,960 |
Deferred expense (benefit): |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  | 3,429 |  |  |  | (443 | ) |  |  | (1,181 | )
Foreign |  |  | (184 | ) |  |  | (112 | ) |  |  | (114 | )
State and local |  |  | 266 |  |  |  | (8 | ) |  |  | (72 | )
|  |  | 3,511 |  |  |  | (563 | ) |  |  | (1,367 | )
Income tax expense |  | $ | 11,599 |  |  | $ | 12,157 |  |  | $ | 17,593 |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] |
|  | 2016 |  |  | 2015 |  |  | 2014 |
Income taxes at statutory rate |  | $ | 12,769 |  |  | $ | 13,043 |  |  | $ | 18,807 |
State and local income taxes, net of federal tax benefit |  |  | 576 |  |  |  | 680 |  |  |  | 674 |
Research and development tax credits |  |  | (371 | ) |  |  | (380 | ) |  |  | (371 | )
Domestic production activities deduction |  |  | (822 | ) |  |  | (964 | ) |  |  | (1,324 | )
Lower foreign taxes differential |  |  | (820 | ) |  |  | (476 | ) |  |  | (583 | )
Uncertain tax positions |  |  | (93 | ) |  |  | 26 |  |  |  | 53 |
Valuation allowance |  |  | - |  |  |  | (59 | ) |  |  | 174 |
Other |  |  | 360 |  |  |  | 287 |  |  |  | 163 |
Income tax expense |  | $ | 11,599 |  |  | $ | 12,157 |  |  | $ | 17,593 |
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] |
|  | 2016 |  |  | 2015 |  |  | 2014 |
Deferred tax assets: |  |  |  |  |  |  |  |  |  |  |  |
Inventories |  | $ | 721 |  |  | $ | 1,664 |  |  | $ | 1,030 |
Accrued liabilities |  |  | 3,139 |  |  |  | 2,450 |  |  |  | 2,538 |
Postretirement health benefits obligation |  |  | 7,449 |  |  |  | 7,547 |  |  |  | 7,602 |
Pension |  |  | - |  |  |  | 3,443 |  |  |  | 1,649 |
Deferred revenue |  |  | - |  |  |  | - |  |  |  | 1,267 |
Other |  |  | 879 |  |  |  | 292 |  |  |  | 550 |
Total deferred tax assets |  |  | 12,188 |  |  |  | 15,396 |  |  |  | 14,636 |
Valuation allowance |  |  | (277 | ) |  |  | (277 | ) |  |  | (336 | )
Net deferred tax assets |  |  | 11,911 |  |  |  | 15,119 |  |  |  | 14,300 |
Deferred tax liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  | (16,119 | ) |  |  | (18,059 | ) |  |  | (17,711 | )
Pension |  |  | (3,017 | ) |  |  | - |  |  |  | - |
Total deferred tax liabilities |  |  | (19,136 | ) |  |  | (18,059 | ) |  |  | (17,711 | )
Net deferred tax liabilities |  | $ | (7,225 | ) |  | $ | (2,940 | ) |  | $ | (3,411 | )
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] |
|  | 2016 |  |  | 2015 |  |  | 2014 |
Balance at beginning of year |  | $ | 567 |  |  | $ | 576 |  |  | $ | 516 |
Additions based on tax positions related to the current year |  |  | 101 |  |  |  | 113 |  |  |  | 158 |
Reductions due to lapse of applicable statute of limitations |  |  | (108 | ) |  |  | (101 | ) |  |  | (98 | )
Settlements |  |  | (68 | ) |  |  | (21 | ) |  |  | - |
Balance at end of year |  | $ | 492 |  |  | $ | 567 |  |  | $ | 576 |

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 + Details
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