Related party transactions (Details) - USD ($)	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	May. 21, 2009
Related party transactions
Balance of the two notes and accrued interest (rate of interest 2%)								$ 3,970,897
Balance due including accrued interest PIAMI in millions							$ 11,100,000
Outstanding principal and interest in millions						$ 10,400,000
Company made additional net advances on the loan to PIAMI in millions					$ 360,000
Payments from PIAMI					715,000
The company has recorded a reserve of $million (the full balance) for the combined note.					10,000,000
Company incurred obligations to Pillar totaling approximately $ million				$ 2,100,000	2,100,000
Pillar agreed to relieve the Company of its obligation to pay $ million				2,100,000	$ 2,100,000
Company incurred obligations to Pillar totaling to which was reduced by Prime by a like amount approximately $ million			$ 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