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Note 6 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2014

Income Tax Disclosure [Abstract]

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

		2014				2013				2012
United States		$	49,692			$	40,374			$	40,019
Foreign countries			4,042				3,903				2,428
Total		$	53,734			$	44,277			$	42,447

		2014				2013				2012
Current Expense:
Federal		$	16,638			$	12,159			$	11,542
Foreign			946				792				(324	)
State and local			1,376				981				1,021
			18,960				13,932				12,239
Deferred (benefit) expense:
Federal			(1,181	)			108				2,109
Foreign			(114	)			(38	)			(189	)
State and local			(72	)			171				85
			(1,367	)			241				2,005
Income tax expense		$	17,593			$	14,173			$	14,244

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

		2014				2013				2012
Income taxes at statutory rate		$	18,807			$	15,497			$	14,856
State and local income taxes, net of federal tax benefit			674				587				719
Research and development tax credits			(371	)			(740	)			-
Domestic production activities deduction			(1,324	)			(952	)			(980	)
Lower foreign taxes differential			(583	)			(612	)			(528	)
Uncertain tax positions			53				94				(236	)
Valuation allowance			174				162				-
Other			163				137				413
Income tax expense		$	17,593			$	14,173			$	14,244

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

		2014				2013
Deferred tax assets:
Inventories		$	1,030			$	1,688
Accrued liabilities			2,538				2,341
Postretirement health benefits obligation			7,602				6,545
Pension			1,649				—
Deferred revenue			1,267				—
Other			550				101
Total deferred tax assets			14,636				10,675
Valuation allowance			(336	)			(162	)
Net deferred tax assets			14,300				10,513
Deferred tax liabilities
Depreciation and amortization			(17,711	)			(16,858	)
Pension			—				(1,634	)
Total deferred tax liabilities			(17,711	)			(18,492	)
Net deferred tax liabilities		$	(3,411	)		$	(7,979	)

Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]

		2014				2013				2012
Balance at beginning of year		$	516			$	421			$	1,423
Additions based on tax positions related to the current year			158				189				68
Reduction for tax positions of prior years			—				—				(1	)
Reductions due to lapse of applicable statute of limitations			(98	)			(46	)			(131	)
Settlements			—				(48	)			(938	)
Balance at end of year		$	576			$	516			$	421

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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.

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Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets.

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Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations.

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Tabular disclosure of the change in unrecognized tax benefits.

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