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Note 6 - Inventories (Tables)
 9 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
September 30,
    
December 31,
  
   
2017
    
2016
  
                 
Raw materials
   $
4,081,000
     $
4,313,000
  
Work in process
    
1,609,000
      
2,535,000
  
Finished goods
    
3,774,000
      
4,146,000
  
    $
9,464,000
     $
10,994,000