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Long-term debt and other financing arrangements (Details 2) (USD $)
Jun. 30, 2014
Dec. 31, 2013
Dec. 31, 2012
Maturities of long-term debt      
Total debt $ 26,405,630 $ 26,723,396 $ 20,041,644
Long-term debt except convertible note
     
Maturities of long-term debt      
2014   1,128,674  
2015   696,406  
2016   722,928  
2017   750,565  
2018   714,939  
Thereafter   1,828,788  
Total debt   5,842,300  
Convertible notes three
     
Maturities of long-term debt      
Total debt   $ 20,881,096