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Note 5 - Intangible Assets (Tables)
12 Months Ended
Dec. 31, 2020
Notes Tables  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
   

2020

   

2019

 

Customer relationships

  $ 544,770     $ 494,315  

Patent cost

    204,731       135,683  
      749,501       629,998  

Less Accumulated amortization

    (269,441

)

    (141,282

)

Intangible assets, net

  $ 480,060     $ 488,716  
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

Year ending December 31,

 

Amortization

Expenses

 

2021

    117,488  

2022

    117,489  

2023

    117,488  

2024

    81,171  

2025

    8,535  

Thereafter

    37,889  
    $ 480,060