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Note 7 - Intangible Assets, Net - Schedule of Finite-lived Intangible Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2020
Mar. 31, 2018
Total intangible assets, Gross Carrying Amount $ 15,089 $ 15,089  
Total intangible assets, Accumulated Amortization 1,665 4,253  
Intangible assets, net $ 13,424 10,836  
Customer Relationships [Member] | RivieraWaves [Member]      
Total intangible assets, Weighted Average Amortization Period (Year) 4 years 4 months 24 days    
Total intangible assets, Gross Carrying Amount $ 3,518 3,518  
Total intangible assets, Accumulated Amortization 395 1,262  
Intangible assets, net $ 3,123 2,256  
Customer Backlog [Member] | RivieraWaves [Member]      
Total intangible assets, Weighted Average Amortization Period (Year) 6 months    
Total intangible assets, Gross Carrying Amount $ 72 72  
Total intangible assets, Accumulated Amortization 65 72  
Intangible assets, net $ 7 0  
Core Technologies [Member] | RivieraWaves [Member]      
Total intangible assets, Weighted Average Amortization Period (Year) 7 years 6 months    
Total intangible assets, Gross Carrying Amount $ 2,475 2,475  
Total intangible assets, Accumulated Amortization 150 480  
Intangible assets, net $ 2,325 1,995  
Core Technologies [Member] | Acquisition of Hillcrest Labs [Member]      
Total intangible assets, Weighted Average Amortization Period (Year) 6 years 4 months 24 days    
Total intangible assets, Gross Carrying Amount $ 7,063 7,063  
Total intangible assets, Accumulated Amortization 472 1,575  
Intangible assets, net $ 6,591 5,488  
NB-IoT technologies [Member]      
Total intangible assets, Weighted Average Amortization Period (Year) [1] 7 years    
Total intangible assets, Gross Carrying Amount $ 1,961 [1] 1,961 [1] $ 2,200
Total intangible assets, Accumulated Amortization [1] 583 864  
Intangible assets, net [1] $ 1,378 $ 1,097  
[1] During the first quarter of 2018, the Company entered into an agreement to acquire certain NB-IoT technologies in the amount of $2,800, of which technologies valued at $600 has not been received. Of the $2,200, $210 has not resulted in cash outflows as of December 31, 2020. In addition, the Company participated in programs sponsored by the Hong Kong government for the support of the above investment, and as a result, the Company received during 2019 an amount of $239 related to the NB-IoT technologies, which was reduced from the gross carrying amount of intangible assets. The Company recorded the amortization cost of the NB-IoT technologies in “cost of revenues” on the Company’s consolidated statements of income (loss).