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 $)
Jun. 30, 2013
Dec. 31, 2012
Notes to Financial Statements    
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