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Pension and Profit Sharing - Pension Plan Assets by Fair Value Hiearchy (Details) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Pension plan assets $ 1,325,402 $ 1,246,736 $ 1,315,428
Money Market Fund
     
Pension plan assets 19,609 32,819  
Acme United Common Stock
     
Pension plan assets 110,400 95,000  
Equity Common and Collected Funds
     
Pension plan assets 811,113 757,373  
Fixed Income Common and Collected Funds
     
Pension plan assets 384,280 361,544  
Level 1
     
Pension plan assets 130,009 127,819  
Level 1 | Money Market Fund
     
Pension plan assets 19,609 32,819  
Level 1 | Acme United Common Stock
     
Pension plan assets 110,400 95,000  
Level 2
     
Pension plan assets 1,195,393 1,118,917  
Level 2 | Equity Common and Collected Funds
     
Pension plan assets 811,113 757,373  
Level 2 | Fixed Income Common and Collected Funds
     
Pension plan assets $ 384,280 $ 361,544