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Note 12 - Commitments and Contingencies (Tables)
9 Months Ended
Sep. 30, 2019
Commitments and Contingencies Disclosure [Abstract]  
Lease, Cost [Table Text Block]
The components of lease costs, lease term and discount rate with respect of leases with an initial term of more than 12 months are as follows:

   

Nine Months Ended

   

Three Months Ended

 
   

September 30, 2019

   

September 30, 2019

 
                 

Operating lease cost

  $ 465,735     $ 155,245  

Weighted Average Remaining Lease Term - Operating leases

 

5.08 years

         

Weighted Average Discount Rate - Operating leases

    5

%

       
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
The following is a schedule, by years, of maturities of lease liabilities as of September 30, 2019:

   

Operating Leases

 

The remainder of 2019

  $ 148,990  

Fiscal year 2020

    604,811  

Fiscal year 2021

    622,956  

Fiscal year 2022

    641,644  

Fiscal year 2023

    660,894  

Thereafter

    508,000  

Total undiscounted cash flows

    3,187,295  

Less: imputed interest

    (380,789

)

Present value of lease liabilities

  $ 2,806,506