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Note 6 - Inventories (Tables)
 9 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Inventory Current and Noncurrent [Table Text Block]
   
September 30,
2019
    
December 31,
2018
  
Current:
                
Raw materials
   $
530
     $
1,795
  
Finished goods
    
11,159
      
11,433
  
    $
11,689
     $
13,228
  
                 
Long-term:
                
Raw materials
   $
1,953
     $
2,165
  
Finished goods
    
5,190
      
6,788
  
    $
7,143
     $
8,953
  
Inventory Write-off [Table Text Block]
   
Three months ended
September 30,
    
Nine months ended
September 30,
  
   
2019
    
2018
    
2019
    
2018
  
Net loss incurred on valuation of inventory at lower of cost or market value and write-off of obsolete inventory
   $
168
 
   $
45
 
   $
537
 
   $
471