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Note 4 - Property and Equipment (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
Useful Life
    
201
7
    
2016
  
Production equipment
  
 3
-
10
     $
10,114,398
     $
10,370,462
  
Lab equipment
  
 3
-
10
      
87,094
      
76,658
  
Computer equipment
  
 3
-
5
      
204,553
      
185,652
  
Vehicles
  
 3
-
5
      
75,312
      
39,090
  
Furniture and fixture
  
 
5
 
      
106,047
      
146,453
  
Leasehold improvements
  
 
10
 
      
1,076,731
      
955,563
  
   
 
 
 
      
11,664,135
      
11,773,878
  
Less Accumulated Depreciation
  
 
 
 
      
(9,704,930
)
    
(9,140,320
)
Net Property and Equipment
  
 
 
 
     $
1,959,205
     $
2,633,558