Note 4 - Balance Sheet Components (Tables)

6 Months Ended

Jun. 30, 2015

Disclosure Text Block Supplement [Abstract]

Schedule of Inventory, Current [Table Text Block]

	June 30,		December 31,
	2015		2014
Raw materials	$	12,562	$	7,298
Work in process		24,242		18,950
Finished goods		28,160		14,670
Total	$	64,964	$	40,918

Schedule of Other Assets, Noncurrent [Table Text Block]

	June 30,		December 31,
	2015		2014
Deferred compensation plan assets	$	8,770	$	6,084
Prepaid expense		1,277		1,418
Other		1,019		955
Total	$	11,066	$	8,457

Schedule of Accrued Liabilities [Table Text Block]

	June 30,		December 31,
	2015		2014
Dividends and dividend equivalents	$	8,389	$	6,080
Deferred revenue and customer prepayments		3,849		3,908
Stock rotation reserve		1,691		1,757
Other		4,473		2,958
Total	$	18,402	$	14,703

Schedule of Product Warranty Liability [Table Text Block]

	Three Months Ended June 30,						Six Months Ended June 30,
	2015			2014			2015			2014
Balance at beginning of period	$	296		$	334		$	240		$	451
Warranty provision for product sales		81			68			155			128
Settlements made		(154	)		-			(154	)		(74	)
Unused warranty provision		(18	)		(112	)		(36	)		(215	)
Balance at end of period	$	205		$	290		$	205		$	290

Schedule of Other Assets and Other Liabilities [Table Text Block]

	June 30,		December 31,
	2015		2014
Deferred compensation plan liabilities	$	8,878	$	6,177
Contingent consideration		2,507		2,507
Dividend equivalents		1,380		580
Other		844		940
Total	$	13,609	$	10,204