Quarterly report pursuant to sections 13 or 15(d)

6. Accounts Payable and Accrued Expenses (Details)

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6. Accounts Payable and Accrued Expenses (Details) (USD $)
Sep. 30, 2013
Dec. 31, 2012
Notes to Financial Statements    
Trade accounts payable $ 5,739,625 $ 8,800,525
Accrued expenses 594,024 993,618
Accrued payroll and vacation 79,688 113,860
Interest payable 355,244 93,458
Deferred revenue 13,536 21,947
Other 856,309 556,088
Total accounts payable and accrued expenses $ 7,638,426 $ 10,579,496