Summary of options outstanding and exercisable (Details)	Number Outstanding	Weighted Average Remaining Contractual Life (Options Outstanding)	Weighted-Average Exercise Price (Options Outstanding)	Number Exercisable	Weighted-Average Exercise Price (Options Exercisable)	Weighted Average Remaining Contractual Life (Options Exercisable)
Balance of options outstanding and exercisable at Dec 31, 2013 at Dec. 31, 2013	0					0
Exercise Price 13.50	3,480	4.46		3,480		4.46
Exercise Price 12.50	2,000	5.78		2,000		5.78
Exercise Price 8.50	500	6.5		500		6.5
Exercise Price 5.00	14,800	6.79		14,800		6.79
Exercise Price 0.65	36,924	8.25		36,924		8.25
Exercise Price 0.63	38,096	3.5		38,096		3.5
Exercise Price 0.51	285,150	5.29		285,150		5.29
Exercise Price total	380,950	5.45	0.9	380,950	0.9	5.45
Balance of options outstanding and exercisable at Dec 31, 2014 at Dec. 31, 2014	0					0