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Note 5 - Accrued Expenses
12 Months Ended
Dec. 31, 2019
Notes to Financial Statements  
Accounts Payable and Accrued Liabilities Disclosure [Text Block]
5.
Accrued Expenses
 
The accrued expenses consisted of:
      As of December 31, 2018       As of December 31, 2019  
         
Accrued payroll expenses    
93,404
     
231,093
 
Accrued interest expense    
565,623
     
590,216
 
Accrued general and administrative expenses    
348,761
     
111,720
 
Accrued commissions    
39,545
     
67,682
 
Other accrued expenses    
254,472
     
724,610
 
Total    
1,301,805
     
1,725,321