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Related party transactions (Details) - USD ($)
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Related party transactions          
The company has recorded a reserve of (the full balance) for the combined note.         $ 10,000,000
Company incurred obligations to Pillar totaling approximately       $ 2,100,000 2,100,000
Pillar agreed to relieve the Company of its obligation to pay       2,100,000 $ 2,100,000
Company incurred obligations to Pillar totaling to which was reduced by Prime by a like amount approximately     $ 1,600,000    
Obligations to pay $ 1,400,000        
The Company and several other defendants settled a lawsuit       225,000  
Paid the entire amount and has a note receivable from one of the other defendants       $ 112,500  
Accrued interest thereon was paid   $ 112,500