Stock options (Details) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Options
Outstanding Beginning	6,250	60,417
Granted	0	0
Cancelled or Exercised	0	(54,167)
Outstanding Ending	6,250	6,250
Weighted-Average Exercise Price
Weighted-Average Exercise Price	$ 2.56	$ 1.82
Granted	0
Cancelled or Exercised	0	1.73
Weighted-Average Exercise Price	$ 2.56	$ 2.56