Note 3 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenues	$ 16,969	$ 17,569
Transferred at Point in Time [Member]
Revenues	13,869	15,010
Transferred over Time [Member]
Revenues	3,100	2,559
Connectivity Products [Member]
Revenues	12,251	13,319
Smart Sensing Products [Member]
Revenues	4,718	4,250
License [Member]
Revenues	11,011	10,083
License [Member] | Transferred at Point in Time [Member]
Revenues	7,911	7,524
License [Member] | Transferred over Time [Member]
Revenues	3,100	2,559
License [Member] | Connectivity Products [Member]
Revenues	6,631	6,358
License [Member] | Smart Sensing Products [Member]
Revenues	4,380	3,725
Royalty [Member]
Revenues	5,958	7,486
Royalty [Member] | Transferred at Point in Time [Member]
Revenues	5,958	7,486
Royalty [Member] | Transferred over Time [Member]
Revenues
Royalty [Member] | Connectivity Products [Member]
Revenues	5,620	6,961
Royalty [Member] | Smart Sensing Products [Member]
Revenues	338	525
UNITED STATES
Revenues	1,779	1,707
UNITED STATES | License [Member]
Revenues	1,493	1,360
UNITED STATES | Royalty [Member]
Revenues	286	347
Europe and Middle East [Member]
Revenues	3,342	2,453
Europe and Middle East [Member] | License [Member]
Revenues	1,382	1,338
Europe and Middle East [Member] | Royalty [Member]
Revenues	1,960	1,115
Asia Pacific [Member]
Revenues	11,848	13,409
Asia Pacific [Member] | License [Member]
Revenues	8,136	7,385
Asia Pacific [Member] | Royalty [Member]
Revenues	$ 3,712	$ 6,024