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Note 4 - Accounts Receivable (Tables)
3 Months Ended
Mar. 31, 2021
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
   
March 31, 2021
   
December 31, 2020
 
Billed federal government
  $
1,153,203
    $
1,425,217
 
Unbilled receivables
   
32,760
     
17,014
 
Accounts receivable
  $
1,185,963
    $
1,442,231