Note 19 - Segment Information (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]

	Years Ended December 31
	2018		2017		2016
China	$	55,303	$	51,962	$	46,784
Taiwan		1,987		2,305		3,009
Japan		1,485		3,148		2,535
Malaysia		1,396		94		7
Korea		1,201		1,435		2,257
Singapore		959		905		1,539
Other		383		356		430
Total	$	62,714	$	60,205	$	56,561

Revenue from External Customers by Products and Services [Table Text Block]

	Years Ended December 31
	2018		2017		2016
Integrated Circuits
Mixed-signal	$	39,603	$	40,334	$	40,866
Analog		23,063		19,801		15,623
Digital		48		50		65
Licensed intellectual property		-		20		7
Total	$	62,714	$	60,205	$	56,561

Schedules of Concentration of Risk, by Risk Factor [Table Text Block]

	Years Ended December 31
	2018			2017			2016
Customer A		13	%		15	%		8	%
Customer B		11	%		9	%		10	%

Long-lived Assets by Geographic Areas [Table Text Block]

	December 31
	2018		2017		2016
Taiwan	$	6,037	$	6,145	$	5,607
U.S.A.		4,029		4,015		4,176
China		3,620		3,565		3,920
Other		28		30		33
Total	$	13,714	$	13,755	$	13,736