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Note 16 - Geographical Information (Tables)
 9 Months Ended
Sep. 30, 2019
Notes Tables  
Revenue from External Customers by Geographic Areas [Table Text Block]
   
Three Months Ended
September 30,
  
Nine Months Ended
September 30,
    2019   2018   2019   2018
Net Sales                                
Spain    
612
     $
1,341
     $
2,278
     $
4,724
  
United States    
623
      
150
      
1,611
      
2,095
  
India    
—
      
1,056
      
864
      
1,959
  
China    
—
      
—
      
—
      
30
  
Total Net Sales   $
1,235
     $
2,547
     $
4,753
     $
8,808
  
Long-lived Assets by Geographic Areas [Table Text Block]
    September 30,   December 31,
    2019   2018
Long-Lived Assets                
United States   $
722
     $
1,180
  
Spain    
9,479
      
9,707
  
Total Long-Lived Assets   $
10,201
     $
10,887