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Note 5 - Notes Payable (Tables)
3 Months Ended
Mar. 31, 2022
Notes Tables  
Schedule of Short-Term Debt [Table Text Block]
   

March 31,

2022

   

December 31,

2021

 

Short-term portion of Avenue Ventures note payable

  $ 5,696,486     $ 4,375,000  

Short-term notes payable

    200,000       200,000  
    $ 5,896,486     $ 4,575,000