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Note 3 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Revenues $ 25,402 $ 23,615
Transferred at Point in Time [Member]    
Revenues 22,993 20,158
Transferred over Time [Member]    
Revenues 2,409 3,457
Connectivity Products [Member]    
Revenues 20,910 17,969
Smart Sensing Products [Member]    
Revenues 4,492 5,646
License [Member]    
Revenues 14,397 14,495
License [Member] | Transferred at Point in Time [Member]    
Revenues 11,988 11,038
License [Member] | Transferred over Time [Member]    
Revenues 2,409 3,457
License [Member] | Connectivity Products [Member]    
Revenues 12,805 10,927
License [Member] | Smart Sensing Products [Member]    
Revenues 1,592 3,568
Royalty [Member]    
Revenues 11,005 9,120
Royalty [Member] | Transferred at Point in Time [Member]    
Revenues 11,005 9,120
Royalty [Member] | Transferred over Time [Member]    
Revenues 0 0
Royalty [Member] | Connectivity Products [Member]    
Revenues 8,105 7,042
Royalty [Member] | Smart Sensing Products [Member]    
Revenues 2,900 2,078
UNITED STATES    
Revenues 3,950 3,295
UNITED STATES | License [Member]    
Revenues 572 2,782
UNITED STATES | Royalty [Member]    
Revenues 3,378 513
Europe and Middle East [Member]    
Revenues 1,099 5,103
Europe and Middle East [Member] | License [Member]    
Revenues 423 1,059
Europe and Middle East [Member] | Royalty [Member]    
Revenues 676 4,044
Asia Pacific [Member]    
Revenues 20,353 15,217
Asia Pacific [Member] | License [Member]    
Revenues 13,402 10,654
Asia Pacific [Member] | Royalty [Member]    
Revenues $ 6,951 $ 4,563