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Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
Mar. 31, 2012
Dec. 31, 2011
Cash and cash equivalents, UDT $ 27,616,419 $ 29,848,798
Property, plant, and equipment, UDT 49,945,189 47,635,907
Accumulated depreciation and amortization, UDT 34,927,194 34,289,450
Accrued expenses, UDT 4,443,124 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) 6,643,778 6,554,746
Common stock, outstanding shares (in shares) 6,643,778 6,554,746
UDT
    
Cash and cash equivalents, UDT 0 278,475
Property, plant, and equipment, UDT   2,099,960
Accumulated depreciation and amortization, UDT   1,448,928
Accrued expenses, UDT   $ 14,400