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Note 4 - Inventories
12 Months Ended
Dec. 31, 2019
Notes to Financial Statements  
Inventory Disclosure [Text Block]
Note
4
- Inventories
 
Inventories consist of:
               
   
201
9
   
201
8
 
                 
Raw materials
  $
1,281,250
    $
1,656,488
 
Work-in-process
   
428,463
     
205,385
 
Inventories
  $
1,709,713
    $
1,861,873