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Note 6 - Inventories (Tables)
9 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
September 30,
   
December 31,
 
   
2019
   
2018
 
                 
Raw materials
  $
4,466,000
    $
4,732,000
 
Work in process
   
2,578,000
     
825,000
 
Finished goods
   
4,211,000
     
4,321,000
 
    $
11,255,000
    $
9,878,000