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Note 2 - Inventories (Tables)
9 Months Ended
Sep. 30, 2021
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   

Sep 30, 2021

   

Dec 31, 2020

 
                 

Raw materials

  $ 1,487,128     $ 1,323,655  

Work-in-progress

    356,365       428,753  

Finished goods

    1,104,345       1,065,458  

Reduction to LIFO cost

    (1,298,321 )     (1,172,891 )
                 

Total Inventories

  $ 1,649,517     $ 1,644,975