Note 2 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues	$ 87,152	$ 77,877	$ 87,507
Transferred at Point in Time [Member]
Revenues	73,056	68,175
Transferred over Time [Member]
Revenues	14,096	9,702
Connectivity Products [Member]
Revenues	70,677	65,683
Smart Sensing Products [Member]
Revenues	16,475	12,194
License [Member]
Revenues	47,890	40,446	42,899
License [Member] | Transferred at Point in Time [Member]
Revenues	33,794	30,744
License [Member] | Transferred over Time [Member]
Revenues	14,096	9,702
License [Member] | Connectivity Products [Member]
Revenues	36,471	30,628
License [Member] | Smart Sensing Products [Member]
Revenues	11,419	9,818
Royalty [Member]
Revenues	39,262	37,431	44,608
Royalty [Member] | Transferred at Point in Time [Member]
Revenues	39,262	37,431
Royalty [Member] | Transferred over Time [Member]
Revenues
Royalty [Member] | Connectivity Products [Member]
Revenues	34,206	35,055
Royalty [Member] | Smart Sensing Products [Member]
Revenues	5,056	2,376
UNITED STATES
Revenues	16,627	8,354	7,188
UNITED STATES | License [Member]
Revenues	15,203	6,260
UNITED STATES | Royalty [Member]
Revenues	1,424	2,094
Europe and Middle East [Member]
Revenues	21,493	17,370	11,007
Europe and Middle East [Member] | License [Member]
Revenues	5,282	3,672
Europe and Middle East [Member] | Royalty [Member]
Revenues	16,211	13,698
Asia Pacific [Member]
Revenues	49,032	52,153	$ 69,312
Asia Pacific [Member] | License [Member]
Revenues	27,405	30,514
Asia Pacific [Member] | Royalty [Member]
Revenues	$ 21,627	$ 21,639