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Note 6 - Property and Equipment (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
Year Ended December 31,
  
   
201
7
    
201
6
  
Machinery and equipment (5-7 year life)
   $
2,495,959
     $
2,459,532
  
Furniture and fixtures (3-5 year life)
    
248,709
      
246,507
  
Leasehold improvements (5-7 year life)
    
269,819
      
269,819
  
     
3,014,487
      
2,975,858
  
Less accumulated depreciation and amortization
    
(2,838,716
)
    
(2,513,022
)
Total
   $
175,771
     $
462,836