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Note 6 - Inventories (Tables)
6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
June 30,
   
December 31,
 
   
2018
   
2017
 
                 
Raw materials
  $
3,967,000
    $
4,567,000
 
Work in process
   
1,154,000
     
1,058,000
 
Finished goods
   
4,570,000
     
4,624,000
 
    $
9,691,000
    $
10,249,000