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Note 3 - Receivables
 12 Months Ended
Dec. 31, 2019
Notes to Financial Statements  
Accounts and Nontrade Receivable [Text Block]
3.
           Receivables
 
Accounts receivable at
December 31, 2019
and
2018,
consist of the following:
 
    2019     2018  
Billed federal government
   $
668,712
     $
612,679
  
Billed commercial and other
    
-
      
40,160
  
Accounts receivable
   $
668,712
     $
652,839
  
 
Billed receivables from the federal government include amounts due from both prime contracts and subcontracts where the federal government is the end customer.