Note 16 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2017

Notes Tables

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

	Years ended December 31,
	2017			2016		2015
Income before income taxes
Domestic	$	48,446		$	50,181	$	48,608
Foreign		(2,244	)		689		(354	)
	$	46,202		$	50,870	$	48,254

	Years ended December 31,
	2017			2016			2015
Provision for (benefit from) income taxes:
Current provision:
Federal	$	12,608		$	14,982		$	14,572
State		2,737			3,265			3,635
Foreign		31			302			249
		15,376			18,549			18,456
Deferred provision:
Federal		(426	)		(70	)		(370	)
State		(68	)		(84	)		(33	)
Foreign		(496	)		(72	)		(557	)
		(990	)		(226	)		(960	)
Total provision	$	14,386		$	18,323		$	17,496

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

	December 31,
	2017		2016
Deferred tax assets:
Net operating loss carry forward, foreign	$	959	$	1,253
Stock-based compensation expense		2,309		1,882
Foreign currency exchange		265		677
Accrued expenses and other		496		308
Inventory reserve		740		640
Deferred tax assets	$	4,769	$	4,760

	December 31,
	2017			2016
Deferred tax liabilities:
Acquisition-related Intangibles	$	(2,743	)	$	(2,932	)
Depreciation		(7,419	)		(8,376	)
Deferred tax liabilities	$	(10,162	)	$	(11,308	)
Net deferred tax liabilities	$	(5,393	)	$	(6,548	)

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

	Years ended December 31,
	2017			2016			2015
Statutory federal income tax rate		35.0	%		35.0	%		35.0	%
State tax expense, net of federal benefit		4.8	%		4.5	%		4.8	%
Impact of rate change on deferred taxes		(4.9	%)		0.0	%		0.0	%
Permanent items, including nondeductible expenses		0.6	%		0.5	%		(0.3	%)
State investment tax credit		(0.7	%)		(0.1	%)		0.0	%
Federal, state and foreign research and development credits		(1.4	%)		(0.9	%)		(0.4	%)
Foreign rate differential		0.5	%		(0.1	%)		0.1	%
Domestic production deduction		(2.8	%)		(2.9	%)		(2.9	%)
Effective income tax rate		31.1	%		36.0	%		36.3	%