Note 3 - Balance Sheet Components (Tables)

9 Months Ended

Sep. 30, 2016

Notes Tables

Schedule of Inventory, Current [Table Text Block]

	September 30,		December 31,
	2016		2015
Raw materials	$	13,521	$	14,907
Work in process		24,850		21,177
Finished goods		32,321		27,125
Total	$	70,692	$	63,209

Schedule of Other Assets, Noncurrent [Table Text Block]

	September 30,		December 31,
	2016		2015
Deferred compensation plan assets	$	17,396	$	13,985
Prepaid wafer purchase		10,000		-
Other prepaid expense		1,269		1,257
Other		1,172		1,099
Total	$	29,837	$	16,341

Schedule of Accrued Liabilities [Table Text Block]

	September 30,		December 31,
	2016		2015
Dividends and dividend equivalents	$	9,043	$	8,675
Deferred revenue and customer prepayments		5,571		5,236
Stock rotation reserve		2,991		2,372
Warranty		991		289
Commissions		990		763
Sales rebate		395		268
Income tax payable		418		465
Other		1,474		1,916
Total	$	21,873	$	19,984

Schedule of Product Warranty Liability [Table Text Block]

	Three Months Ended September 30,						Nine Months Ended September 30,
	2016			2015			2016			2015
Balance at beginning of period	$	950		$	205		$	289		$	240
Warranty provision for product sales		107			91			926			246
Settlement made		(25	)		-			(67	)		(153	)
Unused warranty provision		(41	)		(28	)		(157	)		(65	)
Balance at end of period	$	991		$	268		$	991		$	268

Other Noncurrent Liabilities [Table Text Block]

	September 30,		December 31,
	2016		2015
Deferred compensation plan liabilities	$	16,422	$	14,147
Dividend equivalents		2,915		2,019
Other		111		379
Total	$	19,448	$	16,545