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Note 3 - Property, Plant, and Equipment (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Property, Plant and Equipment [Table Text Block]
       
2018
    
2017
  
                     
Land and land improvements
  
$
905,190
    $
905,190
  
Building
  
 
9,964,523
     
9,950,190
  
Machinery and equipment
  
 
180,519
     
4,755,727
  
Office equipment
  
 
1,157,392
     
1,183,115
  
Computer equipment and software
  
 
2,212,935
     
2,261,038
  
       
 
14,420,559
     
19,055,260
  
Less accumulated depreciation
  
 
9,722,009
     
13,378,021
  
       
$
4,698,550
    $
5,677,239