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Note 8 - Long-term Debt (Tables)
9 Months Ended
Sep. 30, 2021
Notes Tables  
Schedule of Long-term Debt Instruments [Table Text Block]
   

September 30,

2021

   

December 31,

2020

 

Long-term portion of Avenue Ventures note payable

  $ 12,916,667     $ -  
    $ 12,916,667     $ -