Quarterly report pursuant to sections 13 or 15(d)

6. Accounts Payable and Accrued Expenses (Tables)

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6. Accounts Payable and Accrued Expenses (Tables)
6 Months Ended
Jun. 30, 2013
Notes to Financial Statements  
Accounts payable and accrued expenses

    June 30, 2013   December 31, 2012
    (unaudited)    
Trade accounts payable   $ 6,600,072     $ 8,800,525  
Accrued expenses     700,593       993,618  
Accrued payroll and vacation     74,609       113,860  
Interest payable     250,187       93,458  
Deferred revenue     13,070       21,947  
Other     801,990       556,088  
Total accounts payable and accrued expenses   $ 8,440,521     $ 10,579,496