Note 5 - Balance Sheet Components (Tables)

12 Months Ended

Dec. 31, 2020

Notes Tables

Schedule of Inventory, Current [Table Text Block]

	December 31,
	2020		2019
Raw materials	$	25,503	$	22,872
Work in process		77,100		42,681
Finished goods		54,459		61,947
Total	$	157,062	$	127,500

Schedule of Other Current Assets [Table Text Block]

	December 31,
	2020		2019
RSU tax withholding proceeds receivable	$	12,504	$	6,106
Prepaid expense		5,032		7,991
Accrued interest receivable		1,914		2,490
Assets for product returns		1,684		1,585
Other		1,846		1,433
Total	$	22,980	$	19,605

Property, Plant and Equipment [Table Text Block]

	December 31,
	2020			2019
Land	$	35,432		$	35,040
Production equipment and software		163,317			134,292
Buildings and improvements		142,869			131,057
Transportation equipment		18,396			16,510
Leasehold improvements		8,705			6,583
Furniture and fixtures		6,383			4,660
Construction in progress		49,575			19,104
Property and equipment, gross		424,677			347,246
Less: accumulated depreciation and amortization		(143,149	)		(118,931	)
Total	$	281,528		$	228,315

Schedule of Other Assets, Noncurrent [Table Text Block]

	December 31,
	2020		2019
Deferred compensation plan assets	$	46,146	$	38,858
Operating lease ROU assets		3,719		2,863
Prepaid expense		2,340		2,687
Debt investment		2,861		3,138
Equity investment in a privately held company		3,400		-
Other		1,372		1,544
Total	$	59,838	$	49,090

Schedule of Accrued Liabilities [Table Text Block]

	December 31,
	2020		2019
Dividends and dividend equivalents	$	26,435	$	21,747
Stock rotation and sales returns		6,005		5,530
Accrued purchases of property and equipment		5,841		4,678
Income tax payable		3,755		2,435
Customer prepayments		7,238		3,412
Commissions		1,107		1,425
Operating lease liabilities		1,406		1,254
Warranty		6,895		1,139
Other		4,278		3,170
Total	$	62,960	$	44,790

Other Noncurrent Liabilities [Table Text Block]

	December 31,
	2020		2019
Deferred compensation plan liabilities	$	48,280	$	39,665
Dividend equivalents		7,871		6,265
Operating lease liabilities		1,693		1,103
Other		29		30
Total	$	57,873	$	47,063