Note 3 - Balance Sheet Components (Tables)

3 Months Ended

Mar. 31, 2017

Notes Tables

Schedule of Inventory, Current [Table Text Block]

	March 31,		December 31,
	2017		2016
Raw materials	$	15,640	$	14,599
Work in process		32,903		26,048
Finished goods		29,992		30,822
Total	$	78,535	$	71,469

Schedule of Other Current Assets [Table Text Block]

	March 31,		December 31,
	2017		2016
Prepaid wafer purchase	$	5,000	$	5,000
Other prepaid expense		3,281		2,249
Interest receivable		1,295		966
Other		1,469		828
Total	$	11,045	$	9,043

Schedule of Other Assets, Noncurrent [Table Text Block]

	March 31,		December 31,
	2017		2016
Deferred compensation plan assets	$	22,001	$	20,288
Prepaid wafer purchase		5,000		5,000
Other prepaid expense		1,235		1,117
Other		1,572		1,006
Total	$	29,808	$	27,411

Schedule of Accrued Liabilities [Table Text Block]

	March 31,		December 31,
	2017		2016
Dividends and dividend equivalents	$	9,437	$	8,946
Deferred revenue and customer prepayments		5,496		6,799
Stock rotation reserve		3,481		1,937
Warranty		1,346		1,030
Commissions		1,007		1,008
Income tax payable		259		1,239
Other		1,891		1,957
Total	$	22,917	$	22,916

Schedule of Product Warranty Liability [Table Text Block]

	Three Months Ended March 31,
	2017			2016
Balance at beginning of period	$	1,030		$	289
Warranty provision for product sales		791			85
Settlements made		(296	)		-
Unused warranty provision		(179	)		(38	)
Balance at end of period	$	1,346		$	336

Other Noncurrent Liabilities [Table Text Block]

	March 31,		December 31,
	2017		2016
Deferred compensation plan liabilities	$	21,777	$	19,836
Dividend equivalents		3,708		3,294
Other		72		89
Total	$	25,557	$	23,219