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Note 4 - Property, Plant, and Equipment (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
2019
    
2018
  
                 
Land and land improvements
  
$
905,190
     $
905,190
  
Building
  
 
10,145,005
      
9,964,523
  
Office and other equipment
  
 
1,237,142
      
1,337,911
  
Computer equipment and software
  
 
2,240,063
      
2,212,935
  
   
 
14,527,400
      
14,420,559
  
Less accumulated depreciation
  
 
10,086,560
      
9,722,009
  
   
$
4,440,840
     $
4,698,550