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Note 6 - Inventories (Tables)
6 Months Ended
Jun. 30, 2020
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
June 30,
   
December 31,
 
   
2020
   
2019
 
                 
Raw materials
  $
6,711,000
    $
4,284,000
 
Work in process
   
2,626,000
     
2,559,000
 
Finished goods
   
2,643,000
     
4,460,000
 
    $
11,980,000
    $
11,303,000