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Note 6 - Property, Plant and Equipment, Net
3 Months Ended
Mar. 31, 2021
Notes to Financial Statements  
Property, Plant and Equipment Disclosure [Text Block]
6.
 
PROPERTY, PLANT AND EQUIPMENT, NET
 
Property, plant and equipment are recorded at cost and depreciated over their useful lives. Maintenance and repair costs are expenses as incurred. Property, plant and equipment are as follows:
 
   
March 31,
2021
   
December 31,
2020
 
                 
Land
  $
228,872
    $
228,872
 
Buildings and improvements
   
2,434,882
     
2,061,887
 
Machinery & equipment
   
20,251,375
     
14,329,462
 
Total property, plant & equipment
   
22,915,129
     
16,620,221
 
Less: accumulated depreciation
   
7,628,872
     
5,329,438
 
Property plant & equipment, net
  $
15,286,257
    $
11,290,783
 
 
Depreciation expense was
$508,937
 and
$434,684
for the
three
months ended
March 31, 2021
and
2020,
respectively.