Note 3 - Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

Fair Value, Assets Measured on Recurring Basis [Table Text Block]

	Fair Value Measurements at the End of the Reporting Period
	Level 1		Level 2		Level 3		Total
Items measured at fair value on a recurring basis at December 31, 2018
Cash and cash equivalents
Money market funds	$	-	$	165	$	-	$	165
Long-term investments
Excelliance MOS Co., Ltd (“EMC”)	$	9,417	$	-	$	-	$	9,417
Items measured at fair value on a recurring basis at December 31, 2017
Cash and cash equivalents
Money market funds	$	-	$	163	$	-	$	163

Fair Value Measurements, Nonrecurring [Table Text Block]

	Level 1		Level 2		Level 3		Total		Total Losses
Items measured at fair value on a nonrecurring basis at December 31, 2018 (nil at December 31, 2017)
Long-term investments
Philip Ventures Enterprise Fund (“PVEF”)	$	-	$	-	$	36	$	36	$	-
Sigurd Microelectronics (Cayman) Co., Ltd. (“Sigurd Cayman”)		-		-		992		992		(240	)
	$	-	$	-	$	1,028	$	1,028	$	(240	)