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Note 4 - Accounts Receivable (Tables)
9 Months Ended
Sep. 30, 2021
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
  

September 30,
2021

  

December 31,
2020

 

Billed federal government

 $2,832,906  $1,425,217 

Unbilled receivables

  41,750   17,014 

Accounts receivable

 $2,874,656  $1,442,231