Annual report pursuant to section 13 and 15(d)

11. Accounts Payable and Accrued Expenses (Details)

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11. Accounts Payable and Accrued Expenses (Details) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Notes to Financial Statements    
Trade accounts payable $ 8,800,525 $ 8,061,024
Accrued expenses 993,618 471,029
Accrued payroll and vacation 113,860 110,829
Interest payable 93,458 376,506
Deferred revenue 21,947 10,044
Other 556,088 608,515
Total accounts payable and accrued expenses $ 10,579,496 $ 9,448,981