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Note 11 - Costs to Obtain and Fulfill a Contract (Tables)
9 Months Ended
Sep. 30, 2021
Notes Tables  
Capitalized Contract Cost [Table Text Block]
    September 30, 2021  
         

Balance, beginning of period

  $ 111,066  

Deferral of costs

    130,520  

Recognized costs

    (128,390 )

Balance, end of period

  $ 113,196