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Accrued Expenses (Details) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Accrued Expenses      
Compensation $ 2,890,040 $ 2,221,730  
Benefits / self-insurance reserve 626,020 621,931  
Paid time off 869,020 841,357  
Commissions payable 355,212 393,028  
Unrecognized tax benefits (see Note 10) 290,000 320,000 685,000
PAC Foam purchase hold-back 600,000    
Other 1,962,550 1,142,117  
Accrued expenses $ 7,592,842 $ 5,540,163