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Note 7 - Intangible Assets, Net (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2018
Dec. 31, 2022
Dec. 31, 2019
Finite-Lived Intangible Assets, Gross, Total $ 22,661     $ 22,661  
Amortization of Intangible Assets, Total 329 $ 750      
Immervision Technology [Member] | Operating Expense [Member]          
Impairment of Intangible Assets, Finite-Lived       3,556  
NB-IoT technologies [Member]          
Finite-lived Intangible Assets Acquired     $ 2,800    
Finite Lived Intangible Assets Acquired, Balance Not Received     600    
Finite-Lived Intangible Assets, Gross, Total 1,961   $ 2,200 $ 1,961  
Intangible Assets Expenditures Incurred but Not yet Paid $ 210        
Amortization of Intangible Assets, Total         $ 239