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Note 5 - Property and Equipment (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
Estimated
useful lives
   
As of December 31,
  
   
in years
    
2017
    
2016
  
Office furniture and equipment
    
3
to
10
     $
4,904
     $
4,835
  
Leasehold improvements
    
1
to
6
      
1,509
      
1,495
  
Vehicles
    
5
to
10
      
160
      
-
  
Manufacturing and test equipment
    
2
to
10
      
2,577
      
2,537
  
     
 
 
 
      
9,150
      
8,867
  
Accumulated depreciation and amortization
    
 
 
 
      
(7,601
)
    
(7,354
)
Property and equipment, net
    
 
 
 
     $
1,549
     $
1,513