Stock options (Details 1) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Outstanding Ending	6,250	6,250
Weighted-Average Exercise Price	$ 2.56	$ 1.82
Number Exercisable	0	(54,167)
Weighted-Average Exercise Price	$ 2.56	$ 2.56
$1.44 - $3.12 [Member]
Outstanding Ending	6,250
Weighted Average Remaining Contractual Life	3 years 5 months 12 days
Weighted-Average Exercise Price	$ 2.56
Number Exercisable	6,250
Weighted-Average Exercise Price	$ 2.56	$ 2.56