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Note 5 - Inventory (Tables)
 6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
(in thousands)
 
June 30,
2017
 
 
December 31,
2016
 
Raw materials and supplies
   $
438
     $
514
  
Finished goods
    
383
      
555
  
Less allowance for excess and obsolete inventory and lower of cost or estimate net realizable value adjustments
   
(149
)
    
(196
)
Total inventory, net
   $
672
     $
873