Note 2 - Revenue Recognition (Tables)

12 Months Ended

Dec. 31, 2018

Accounting Standards Update 2014-09 [Member]

Notes Tables

Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]

	December 31, 2018
	Topic 606
Line Item	(As Reported)		Topic 605		Change
Assets:
Accounts receivable, net	$	55,214	$	56,502	$	(1,288	)
Inventories	$	136,384	$	136,526	$	(142	)
Other current assets	$	11,931	$	10,329	$	1,602
Total current assets	$	580,810	$	580,638	$	172
Deferred tax assets, net	$	16,830	$	16,931	$	(101	)
Total assets	$	793,432	$	793,361	$	71
Liabilities and Stockholders' Equity:
Accrued liabilities	$	38,962	$	39,103	$	(141	)
Total current liabilities	$	80,439	$	80,580	$	(141	)
Total liabilities	$	153,339	$	153,480	$	(141	)
Retained earnings	$	194,728	$	194,516	$	212
Total stockholders' equity	$	640,093	$	639,881	$	212
Total liabilities and stockholders' equity	$	793,432	$	793,361	$	71

	Year Ended December 31, 2018
	Topic 606
Line Item	(As Reported)		Topic 605		Change
Revenue	$	582,382	$	582,601	$	(219	)
Cost of revenue	$	259,714	$	259,722	$	(8	)
Gross profit	$	322,668	$	322,879	$	(211	)
Income from operations	$	113,488	$	113,699	$	(211	)
Income before income taxes	$	118,482	$	118,693	$	(211	)
Income tax provision	$	13,214	$	13,258	$	(44	)
Net income	$	105,268	$	105,435	$	(167	)
Net income per share - basic	$	2.49	$	2.50	$	(0.01	)

	Year Ended December 31, 2018
	Topic 606
Line Item	(As Reported)		Topic 605		Change
Net income	$	105,268	$	105,435	$	(167	)
Comprehensive income	$	97,912	$	98,079	$	(167	)

	Year Ended December 31, 2018
	Topic 606
Line Item	(As Reported)			Topic 605			Change
Cash flows from operating activities:
Net income	$	105,268		$	105,435		$	(167	)
Changes in operating assets and liabilities:
Accounts receivable	$	(18,079	)	$	(18,465	)	$	386
Inventories	$	(37,060	)	$	(37,202	)	$	142
Other assets	$	(1,075	)	$	435		$	(1,510	)
Accrued liabilities	$	7,092		$	5,899		$	1,193
Income tax liabilities	$	6,923		$	6,967		$	(44	)