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Note 5 - Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2020
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
2020
    
2019
  
                 
Land
   $
6,929,000
     $
6,929,000
  
Buildings
    
15,917,000
      
15,917,000
  
Building improvements
    
8,141,791
      
7,864,757
  
Machinery and equipment
    
3,340,005
      
3,592,351
  
Furniture and fixtures
    
613,765
      
613,765
  
Computer equipment
    
493,349
      
487,902
  
Software
    
435,593
      
438,391
  
Transportation equipment
    
114,511
      
114,511
  
Lab equipment
    
1,992,179
      
1,985,179
  
Construction in Progress
    
93,936
      
2,110,875
  
Totals at cost
   $
38,071,129
     $
40,053,731
  
                 
Less: Accumulated depreciation and amortization
    
(9,227,566
 )    
(7,951,396
 )
Property, plant and equipment, net
   $
28,843,563
     $
32,102,335
  
                 
Depreciation and amortization expense (1)
   $
1,389,145
     $
1,042,829