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Note 3 - Property and Equipment (Tables)
 3 Months Ended
Mar. 31, 2019
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
Useful Life
    
201
9
    
201
8
  
Production equipment
  
3
-
10
     $
9,551,758
     $
9,614,189
  
Lab equipment
  
3
-
10
      
81,367
      
82,930
  
Computer equipment
  
3
-
5
      
298,713
      
204,807
  
Vehicles
  
3
-
5
      
66,031
      
71,711
  
Furniture and fixture
  
 
5
 
      
109,318
      
111,417
  
Leasehold improvements
  
 
10
 
      
1,040,857
      
1,037,678
  
   
 
 
 
      
11,148,044
      
11,122,732
  
Less Accumulated Depreciation
  
 
 
 
      
(9,663,573
)
    
(9,691,083
)
Net Property and Equipment
  
 
 
 
     $
1,484,471
     $
1,431,649