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Note 6 - Payroll Liabilities (Tables)
9 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Accrued Liabilities [Table Text Block]
   
September 30, 2019
   
December 31, 2018
 
Accrued bonuses
  $
526,890
    $
697,995
 
Accrued vacation
   
170,105
     
160,740
 
Accrued payroll
   
72,732
     
76,335
 
Total payroll liabilities
  $
769,727
    $
935,070