Note 4 - Balance Sheet Components (Tables)

3 Months Ended

Mar. 31, 2019

Notes Tables

Schedule of Inventory, Current [Table Text Block]

	March 31,		December 31,
	2019		2018
Raw materials	$	43,142	$	43,017
Work in process		39,402		38,674
Finished goods		59,999		54,693
Total	$	142,543	$	136,384

Schedule of Other Current Assets [Table Text Block]

	March 31,		December 31,
	2019		2018
RSU tax withholding proceeds receivable	$	4,331	$	39
Prepaid expense		3,298		3,425
Assets for product returns		2,225		1,602
Interest receivable		1,457		1,441
Value-added tax receivable		505		423
Prepaid wafer refund receivable		-		4,297
Other		1,813		704
Total	$	13,629	$	11,931

Schedule of Other Assets, Noncurrent [Table Text Block]

	March 31,		December 31,
	2019		2018
Deferred compensation plan assets	$	34,861	$	31,970
Prepaid expense		2,775		2,713
Operating lease ROU assets		2,770		-
Other		1,581		1,296
Total	$	41,987	$	35,979

Schedule of Accrued Liabilities [Table Text Block]

	March 31,		December 31,
	2019		2018
Dividends and dividend equivalents	$	21,289	$	15,044
Stock rotation and sales returns		7,580		5,363
Income tax payable		5,527		7,018
Customer prepayments		2,927		2,520
Warranty		2,045		4,564
Commissions		1,661		1,369
Operating lease liabilities		1,158		-
Other		3,161		3,084
Total	$	45,348	$	38,962

Other Noncurrent Liabilities [Table Text Block]

	March 31,		December 31,
	2019		2018
Deferred compensation plan liabilities	$	35,310	$	32,283
Dividend equivalents		5,670		6,145
Operating lease liabilities		996		-
Other		31		97
Total	$	42,007	$	38,525