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Note 11 - Costs to Obtain and Fulfill a Contract (Tables)
3 Months Ended
Mar. 31, 2021
Notes Tables  
Capitalized Contract Cost [Table Text Block]
  March 31, 2021 
     
Balance, beginning of period $111,066 
Deferral of costs  52,063 
Recognized costs  (47,952)
Balance, end of period $115,177