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Note 5 - Property, Plant and Equipment (Tables)
12 Months Ended
Dec. 31, 2016
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
2016
   
2015
 
Land
  $
2,220,000
    $
2,220,000
 
Buildings
   
6,631,039
     
6,631,039
 
Building improvements
   
5,615,823
     
5,615,823
 
Machinery and equipment
   
2,671,333
     
2,381,964
 
Furniture and fixtures
   
547,144
     
721,919
 
Computer equipment
   
479,534
     
701,367
 
Transportation equipment
   
65,994
     
65,994
 
Lab equipment
   
1,975,533
     
1,972,838
 
Totals at cost
   
20,206,400
     
20,310,944
 
Less: Accumulated depreciation and amortization
   
(5,861,476
)    
(5,517,021
)
Property, plant and equipment, net   $
14,344,924
    $
14,793,923
 
                 
Depreciation and amortization expense (1)
  $
813,657
    $
826,529