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Note 1 - Summary of Significant Accounting Policies (Tables)
 9 Months Ended
Sep. 30, 2017
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
September 30,
    
December 31,
  
   
2017
    
2016
  
Machinery and equipment
   $
2,510
     $
1,493
  
Leasehold improvements
    
1,734
      
1,640
  
Computer equipment
    
709
      
695
  
Furniture and fixtures
    
879
      
877
  
Construction in progress
    
-
      
893
  
Property and equipment, gross
    
5,832
      
5,598
  
Less - accumulated depreciation
    
(1,480)
      
(838)
  
Property and equipment, net
  
$
4,352
    
$
4,760