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Note 1 - Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
   
201
7
    
201
6
  
US-based IT OEM
    
67%
      
39%
  
US- based technology company
    
4%
      
12%
  
US-based data center company
    
0%
      
13%
  
Allowance for Doubtful Accounts [Table Text Block]
   
Year Ended December 31,
  
   
2017
    
2016
  
Balance at beginning of year
   $
4
     $
19
  
Additions charged to expense
    
2
      
5
  
Recovery of amounts previously reserved
    
2
      
(7
)
Amounts written off
    
-
      
(13
)
Balance at end of year
   $
8
     $
4