Note 2 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues	$ 100,326	$ 87,152	$ 77,877
Transferred at Point in Time [Member]
Revenues	87,888	73,056	68,175
Transferred over Time [Member]
Revenues	12,438	14,096	9,702
Connectivity Products [Member]
Revenues	78,665	70,677	65,683
Smart Sensing Products [Member]
Revenues	21,661	16,475	12,194
License [Member]
Revenues	52,513	47,890	40,446
License [Member] | Transferred at Point in Time [Member]
Revenues	40,075	33,794	30,744
License [Member] | Transferred over Time [Member]
Revenues	12,438	14,096	9,702
License [Member] | Connectivity Products [Member]
Revenues	40,748	36,471	30,628
License [Member] | Smart Sensing Products [Member]
Revenues	11,765	11,419	9,818
Royalty [Member]
Revenues	47,813	39,262	37,431
Royalty [Member] | Transferred at Point in Time [Member]
Revenues	47,813	39,262	37,431
Royalty [Member] | Transferred over Time [Member]
Revenues	0	0	0
Royalty [Member] | Connectivity Products [Member]
Revenues	37,917	34,206	35,055
Royalty [Member] | Smart Sensing Products [Member]
Revenues	9,896	5,056	2,376
UNITED STATES
Revenues	20,813	16,627	8,354
UNITED STATES | License [Member]
Revenues	6,716	15,203	6,260
UNITED STATES | Royalty [Member]
Revenues	14,097	1,424	2,094
Europe and Middle East [Member]
Revenues	11,966	21,493	17,370
Europe and Middle East [Member] | License [Member]
Revenues	6,176	5,282	3,672
Europe and Middle East [Member] | Royalty [Member]
Revenues	5,790	16,211	13,698
Asia Pacific [Member]
Revenues	67,547	49,032	52,153
Asia Pacific [Member] | License [Member]
Revenues	39,621	27,405	30,514
Asia Pacific [Member] | Royalty [Member]
Revenues	$ 27,926	$ 21,627	$ 21,639