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Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
Sep. 30, 2012
Dec. 31, 2011
Cash and cash equivalents, UDT $ 31,155,308 $ 29,848,798
Property, plant, and equipment, UDT 55,672,918 47,635,907
Accumulated depreciation and amortization, UDT 36,271,481 34,289,450
Accrued expenses, UDT 5,631,124 5,540,163
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, Authorized shares (in shares) 1,000,000 1,000,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, Authorized shares (in shares) 20,000,000 20,000,000
Common stock, issued shares (in shares) 6,731,929 6,554,746
Common stock, outstanding shares (in shares) 6,731,929 6,554,746
UDT
    
Cash and cash equivalents, UDT   278,475
Property, plant, and equipment, UDT   2,099,960
Accumulated depreciation and amortization, UDT   1,448,928
Accrued expenses, UDT   $ 14,400