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Note 7 - Payroll Liabilities (Tables)
3 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Accrued Liabilities [Table Text Block]
   
As of March 31,
   
As of December 31,
 
   
2020
   
2019
 
Accrued bonuses
  $
203,779
    $
646,064
 
Accrued vacation
   
179,533
     
170,820
 
Accrued payroll
   
83,071
     
82,536
 
Total payroll liabilities
  $
466,383
    $
899,420