Note 3 - Balance Sheet Components (Tables)

9 Months Ended

Sep. 30, 2017

Notes Tables

Schedule of Inventory, Current [Table Text Block]

	September 30,		December 31,
	2017		2016
Raw materials	$	18,861	$	14,599
Work in process		43,462		26,048
Finished goods		37,564		30,822
Total	$	99,887	$	71,469

Schedule of Other Current Assets [Table Text Block]

	September 30,		December 31,
	2017		2016
Prepaid wafer purchase	$	7,642	$	5,000
Other prepaid expense		3,334		2,249
Interest receivable		1,268		966
Other		1,316		828
Total	$	13,560	$	9,043

Schedule of Other Assets, Noncurrent [Table Text Block]

	September 30,		December 31,
	2017		2016
Deferred compensation plan assets	$	24,315	$	20,288
Prepaid wafer purchase		-		5,000
Other prepaid expense		1,010		1,117
Other		1,193		1,006
Total	$	26,518	$	27,411

Schedule of Accrued Liabilities [Table Text Block]

	September 30,		December 31,
	2017		2016
Dividends and dividend equivalents	$	9,390	$	8,946
Deferred revenue and customer prepayments		6,527		6,799
Stock rotation reserve		3,358		1,937
Warranty		2,507		1,030
Income tax payable		1,750		1,239
Commissions		1,035		1,008
Other		2,312		1,957
Total	$	26,879	$	22,916

Schedule of Product Warranty Liability [Table Text Block]

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
Balance at beginning of period	$	2,627		$	950		$	1,030		$	289
Warranty provision for product sales		129			107			2,431			926
Settlements made		(161	)		(25	)		(710	)		(67	)
Unused warranty provision		(88	)		(41	)		(244	)		(157	)
Balance at end of period	$	2,507		$	991		$	2,507		$	991

Other Noncurrent Liabilities [Table Text Block]

	September 30,		December 31,
	2017		2016
Deferred compensation plan liabilities	$	24,146	$	19,836
Dividend equivalents		4,482		3,294
Other		67		89
Total	$	28,695	$	23,219