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Note 6 - Fixed Assets (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
2018
    
2017
  
Machinery and equipment
   $
2,992
     $
2,516
  
Leasehold improvements
    
1,734
      
1,734
  
Computer equipment
    
721
      
714
  
Furniture and fixtures
    
878
      
874
  
Construction in progress
    
317
      
-
  
Property and equipment, gross
    
6,642
      
5,838
  
Less - accumulated depreciation
    
(2,698
 )    
(1,716
 )
Property and equipment, net
  
$
3,944
   
$
4,122