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Note 3 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues	$ 18,400	$ 17,494	$ 35,369	$ 35,063
Transferred at Point in Time [Member]
Revenues	14,992	15,217	28,861	30,227
Transferred over Time [Member]
Revenues	3,408	2,277	6,508	4,836
Connectivity Products [Member]
Revenues	15,140	14,116	27,392	27,435
Smart Sensing Products [Member]
Revenues	3,260	3,378	7,977	7,628
License [Member]
Revenues	10,804	10,038	21,815	20,121
License [Member] \| Transferred at Point in Time [Member]
Revenues	7,396	7,761	15,307	15,285
License [Member] \| Transferred over Time [Member]
Revenues	3,408	2,277	6,508	4,836
License [Member] \| Connectivity Products [Member]
Revenues	8,085	7,201	14,716	13,559
License [Member] \| Smart Sensing Products [Member]
Revenues	2,719	2,837	7,099	6,562
Royalty [Member]
Revenues	7,596	7,456	13,554	14,942
Royalty [Member] \| Transferred at Point in Time [Member]
Revenues	7,596	7,456	13,554	14,942
Royalty [Member] \| Transferred over Time [Member]
Revenues
Royalty [Member] \| Connectivity Products [Member]
Revenues	7,055	6,915	12,676	13,876
Royalty [Member] \| Smart Sensing Products [Member]
Revenues	541	541	878	1,066
UNITED STATES
Revenues	2,123	2,121	3,902	3,828
UNITED STATES \| License [Member]
Revenues	1,866	1,824	3,359	3,184
UNITED STATES \| Royalty [Member]
Revenues	257	297	543	644
Europe and Middle East [Member]
Revenues	2,992	2,713	6,334	5,166
Europe and Middle East [Member] \| License [Member]
Revenues	225	1,414	1,607	2,752
Europe and Middle East [Member] \| Royalty [Member]
Revenues	2,767	1,299	4,727	2,414
Asia Pacific [Member]
Revenues	13,285	12,660	25,133	26,069
Asia Pacific [Member] \| License [Member]
Revenues	8,713	6,800	16,849	14,185
Asia Pacific [Member] \| Royalty [Member]
Revenues	$ 4,572	$ 5,860	$ 8,284	$ 11,884