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Concentrations- Summary of client accounts (Details 1) (Customer Concentration Risk)
12 Months Ended
Dec. 31, 2013
Accounts Receivable
 
Concentration Risk [Line Items]  
Percentage of revenue from major customer 36.10%
Accounts Receivable | Trucking Company | MI
 
Concentration Risk [Line Items]  
Percentage of revenue from major customer 8.70%
Accounts Receivable | Cable trenching utility | FL
 
Concentration Risk [Line Items]  
Percentage of revenue from major customer 6.40%
Accounts Receivable | Importer | MI
 
Concentration Risk [Line Items]  
Percentage of revenue from major customer 8.40%
Accounts Receivable | Aerospace servicer | NM
 
Concentration Risk [Line Items]  
Percentage of revenue from major customer 6.20%
Accounts Receivable | Trucking Company | VA
 
Concentration Risk [Line Items]  
Percentage of revenue from major customer 6.40%
Revenue
 
Concentration Risk [Line Items]  
Percentage of revenue from major customer 16.30%
Revenue | Trucking Company | MI
 
Concentration Risk [Line Items]  
Percentage of revenue from major customer 4.30%
Revenue | Cable trenching utility | FL
 
Concentration Risk [Line Items]  
Percentage of revenue from major customer 3.40%
Revenue | Importer | MI
 
Concentration Risk [Line Items]  
Percentage of revenue from major customer 3.00%
Revenue | Aerospace servicer | NM
 
Concentration Risk [Line Items]  
Percentage of revenue from major customer 3.70%
Revenue | Trucking Company | VA
 
Concentration Risk [Line Items]  
Percentage of revenue from major customer 1.90%