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Note 15 - Leases (Tables)
 3 Months Ended
Mar. 31, 2021
Notes Tables  
Lessee, Operating Lease, Costs, Assets and Liabilities [Table Text Block]
   
3 Months ended
March 31,
2021
    
3 Months ended
March 31,
2020
  
                 
Lease cost
  
 
 
 
  
 
 
 
Operating lease cost
   $
63,973
     $
53,723
  
Total lease cost
   $
63,973
     $
53,723
  
Balance sheet information
  
March 31,
2021
    
December 31,
2020
  
Operating right-of-use assets
   $
430,206
     $
487,325
  
                 
Operating lease liabilities, current portion
   $
230,072
     $
234,309
  
Operating lease liabilities, non-current portion
    
211,442
      
264,163
  
Total operating lease liabilities
   $
441,514
     $
498,472
  
                 
Weighted average remaining lease term (in years) – operating leases
    
2.04
      
2.26
  
Weighted average discount rate – operating leases
    
5.50
%
    
5.50
%
Lessee, Operating Lease, Supplemental Cash Flow Information [Table Text Block]
Cash paid for amounts included in the measurement of operating lease liabilities for the three months ended March 31, 2021 and 2020:   $
63,812
     $
52,301
  
Lessee, Operating Lease, Liability, Maturity [Table Text Block]
2021 (9 months remaining)
   $
193,165
  
2022
    
187,594
  
2023
    
89,225
  
Total future lease payments
   $
469,984
  
Less: imputed interest
    
(28,470
)
Total
   $
441,514