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Note 6 - Inventories
 3 Months Ended
Mar. 31, 2018
Notes to Financial Statements  
Inventory Disclosure [Text Block]
6.
Inventories
 
Inventories, net of reserves, as of
March 31, 2018
and
December 31, 2017
consisted of the following:
 
   
As of
  
   
March 31, 2018
    
December 31, 201
7
  
Current:
                
Raw materials
   $
2,204
     $
197
  
Finished goods
    
12,418
      
14,218
  
    $
14,622
     $
14,415
  
                 
Long-term:
                
Raw materials
   $
2,453
     $
2,682
  
Finished goods
    
6,112
      
6,026
  
    $
8,565
     $
8,708
  
  
Long-term inventory represents inventory held in excess of our current (next
12
months) requirements based on our recent sales and forecasted level of sales. We expect to sell the above inventory, net of reserves, at or above the stated cost and believe that
no
loss will be incurred on its sale, although there can be
no
assurance of the timing or amount of any sales.
 
Current finished goods did 
not
include distributor channel inventories in the amounts of approximately
$1,555
as of
December 31, 2017.
Distributor channel inventories represented inventories at distributors and other customers where revenue recognition criteria had 
not
yet been achieved.
 
Net loss incurred on valuation of inventory at lower of cost or market value and write-off of obsolete inventory during the
three
months ended
March 31, 2018
was
$255.
During the
three
months ended
March 31, 2017
benefit from the reduction of reserves for valuation of inventory at lower of cost or market value was
$34.