Note 4 - Balance Sheet Components (Tables)

9 Months Ended

Sep. 30, 2018

Notes Tables

Schedule of Inventory, Current [Table Text Block]

	September 30,		December 31,
	2018		2017
Raw materials	$	41,679	$	20,573
Work in process		43,112		40,030
Finished goods		51,999		38,678
Total	$	136,790	$	99,281

Schedule of Other Current Assets [Table Text Block]

	September 30,		December 31,
	2018		2017
Prepaid wafer purchase	$	4,297	$	6,217
Other prepaid expense		3,813		2,742
Interest receivable		1,413		1,352
Assets for product returns		2,320		-
Value-added tax receivable		396		1,235
Other		637		1,216
Total	$	12,876	$	12,762

Schedule of Other Assets, Noncurrent [Table Text Block]

	September 30,		December 31,
	2018		2017
Deferred compensation plan assets	$	30,425	$	28,080
Prepaid expense		1,588		897
Other		1,258		1,091
Total	$	33,271	$	30,068

Schedule of Accrued Liabilities [Table Text Block]

	September 30,		December 31,
	2018		2017
Dividends and dividend equivalents	$	14,737	$	9,248
Stock rotation and sales returns		7,464		2,647
Warranty		4,934		2,416
Income tax payable		1,911		2,861
Customer prepayments		1,818		4,742
Commissions		1,334		938
Sales rebate		380		1,036
Deferred income		-		1,845
Other		2,330		1,774
Total	$	34,908	$	27,507

Schedule of Product Warranty Liability [Table Text Block]

	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
Balance at beginning of period	$	3,951		$	2,627		$	2,416		$	1,030
Warranty provision for product sales		3,840			129			5,654			2,431
Settlements made		(36	)		(161	)		(100	)		(710	)
Unused warranty provision		(2,821	)		(88	)		(3,036	)		(244	)
Balance at end of period	$	4,934		$	2,507		$	4,934		$	2,507

Other Noncurrent Liabilities [Table Text Block]

	September 30,		December 31,
	2018		2017
Deferred compensation plan liabilities	$	30,412	$	28,087
Dividend equivalents		5,818		4,881
Other		83		56
Total	$	36,313	$	33,024