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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