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Note 4 - Accounts Receivable | 9 Months Ended
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Sep. 30, 2021
Notes to Financial Statements |
Accounts and Nontrade Receivable [Text Block] |
4. | Accounts Receivable
Accounts receivable at September 30, 2021 and December 31, 2020, consist of the following:
|  | 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 |
Billed receivables from the federal government include amounts due from both prime contracts and subcontracts where the federal government is the end customer.

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