Annual report pursuant to Section 13 and 15(d)

2. Receivables (Tables)

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2. Receivables (Tables)
12 Months Ended
Dec. 31, 2017
Receivables Tables  
Accounts receivable
    2017     2016  
Billed federal government   $ 560,942     $ 693,321  
Billed commercial and other     49,240       67,201  
Total billed     610,182       760,522  
Unbilled     5,532       396,865  
Allowance for doubtful accounts     -       -  
Accounts receivable, net   $ 615,714     $ 1,157,387