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Note 5 - Intangible Assets, net (Tables)
3 Months Ended
Mar. 31, 2019
Disclosure Text Block [Abstract]  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
Intangible assets consisted of the following as of March 31, 2019 and December 31, 2018:

   

March 31, 2019

   

December 31, 2018

 
                 

Customer relationship

  $ 6,150,559     $ 6,150,559  

Trademarks

    200,000       200,000  

Less: accumulated amortization

    (2,656,331

)

    (2,554,655

)

    $ 3,694,228     $ 3,795,904  
Finite-lived Intangible Assets Amortization Expense [Table Text Block]
Estimated amortization expense relating to the existing intangible assets with finite lives for each of the next five years is as follows:

12 months ending March 31,

       

2019

  $ 406,704  

2020

    406,704  

2021

    406,704  

2022

    406,704  

2023

    406,704