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Note 5 - Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
2018
    
2017
  
                 
Land
   $
6,929,000
     $
6,929,000
  
Buildings
    
15,920,925
      
15,917,925
  
Building improvements
    
6,603,121
      
5,805,045
  
Machinery and equipment
    
3,385,357
      
3,246,877
  
Furniture and fixtures
    
611,190
      
563,959
  
Computer equipment
    
487,007
      
587,147
  
Software
    
441,376
      
427,441
  
Transportation equipment
    
65,995
      
65,994
  
Lab equipment
    
1,985,179
      
1,979,180
  
Construction in Progress
    
946,960
      
-
  
Totals at cost
   $
37,376,110
     $
35,522,568
  
                 
Less: Accumulated depreciation and amortization
    
(6,973,552
 )    
(6,683,111
 )
Property, plant and equipment, net
   $
30,402,558
     $
28,839,457
  
                 
Depreciation and amortization expense (1)
   $
1,141,161
     $
867,277