Note 4 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenues	$ 23,471	$ 21,413	$ 58,840	$ 56,476
Transferred at Point in Time [Member]
Revenues	19,670	18,505	48,531	48,732
Transferred over Time [Member]
Revenues	3,801	2,908	10,309	7,744
Connectivity Products [Member]
Revenues	19,032	19,399	46,424	46,834
Smart Sensing Products [Member]
Revenues	4,439	2,014	12,416	9,642
License [Member]
Revenues	11,269	9,786	33,084	29,907
License [Member] | Transferred at Point in Time [Member]
Revenues	7,468	6,878	22,775	22,163
License [Member] | Transferred over Time [Member]
Revenues	3,801	2,908	10,309	7,744
License [Member] | Connectivity Products [Member]
Revenues	8,608	8,210	23,324	21,769
License [Member] | Smart Sensing Products [Member]
Revenues	2,661	1,576	9,760	8,138
Royalty [Member]
Revenues	12,202	11,627	25,756	26,569
Royalty [Member] | Transferred at Point in Time [Member]
Revenues	12,202	11,627	25,756	26,569
Royalty [Member] | Transferred over Time [Member]
Revenues
Royalty [Member] | Connectivity Products [Member]
Revenues	10,424	11,189	23,100	25,065
Royalty [Member] | Smart Sensing Products [Member]
Revenues	1,778	438	2,656	1,504
UNITED STATES
Revenues	3,811	2,259	7,713	6,087
UNITED STATES | License [Member]
Revenues	3,450	1,483	6,809	4,667
UNITED STATES | Royalty [Member]
Revenues	361	776	904	1,420
Europe and Middle East [Member]
Revenues	6,911	6,139	13,245	11,305
Europe and Middle East [Member] | License [Member]
Revenues	1,241	534	2,848	3,286
Europe and Middle East [Member] | Royalty [Member]
Revenues	5,670	5,605	10,397	8,019
Asia Pacific [Member]
Revenues	12,749	13,015	37,882	39,084
Asia Pacific [Member] | License [Member]
Revenues	6,578	7,769	23,427	21,954
Asia Pacific [Member] | Royalty [Member]
Revenues	$ 6,171	$ 5,246	$ 14,455	$ 17,130