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 $)
Mar. 31, 2013
Dec. 31, 2012
Notes to Financial Statements    
Trade accounts payable $ 9,669,660 $ 8,800,525
Accrued expenses 1,033,849 993,618
Accrued payroll and vacation 101,023 113,860
Interest payable 172,966 93,458
Deferred revenue 82,786 21,947
Other 611,102 556,088
Total accounts payable and accrued expenses $ 11,671,386 $ 10,579,496