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Note 12 - Leases (Tables)
9 Months Ended
Sep. 30, 2019
Notes Tables  
Lessee, Operating Lease, Costs, Assets and Liabilities [Table Text Block]
   
3 Months ended
September 30,
   
9 Months ended September 30,
 
   
2019
   
2019
 
                 
Lease cost
 
 
 
 
 
 
 
 
Operating lease cost
  $
46,562
    $
132,524
 
Short-term lease cost
   
10,145
     
41,535
 
Sublease income
   
-
     
-
 
Total lease cost
  $
56,707
    $
174,059
 
                 
Balance sheet information
 
 
 
 
 
 
 
 
Operating ROU assets    
 
    $
611,883
 
                 
Operating lease liabilities, current portion    
 
    $
178,130
 
Operating lease liabilities, non-current portion    
 
     
426,879
 
Total operating lease liabilities    
 
    $
605,009
 
                 
Weighted average remaining lease term (in years) – operating leases    
 
     
3.54
 
Weighted average discount rate – operating leases    
 
     
5.50
%
Lessee, Operating Lease, Supplemental Cash Flow Information [Table Text Block]
Cash paid for amounts included in the measurement of operating lease liabilities
  $
126,804
 
Lessee, Operating Lease, Liability, Maturity [Table Text Block]
2019 (remaining three months)
  $
52,301
 
2020
   
197,724
 
2021
   
170,853
 
2022
   
160,817
 
2023
   
89,226
 
Total future lease payments
  $
670,921
 
Less: imputed interest
   
(65,912
)
Total
  $
605,009