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Note 9 - Prepaid Expenses and Other (Tables)
3 Months Ended
Mar. 31, 2021
Notes Tables  
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block]
   
March 31,
   
December 31,
 
   
2021
   
2020
 
                 
                 
Deposit for inventory
  $
1,423,445
    $
66,995
 
Other prepaid expenses
   
109,371
     
64,178
 
Insurance
   
46,935
     
45,468
 
Software licenses
   
26,410
     
24,866
 
Total prepayments
  $
1,606,161
    $
201,507