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Note 5 - Goodwill and Intangible Assets (Tables)
9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Goodwill [Table Text Block]
Carrying value of goodwill at December 31, 2017:
  $
6,929,258
 
Impairment of goodwill
   
(4,186,050
)
Carrying value of goodwill at September 30, 2018:
  $
2,743,208