Summary of Stock Option Activity (Details) - $ / shares	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015
Number of Common Shares, Options Outstanding
Number of Common Shares, Options Outstanding, Beginning of year	3,402,481	2,419,529
Number of Common Shares, Options Outstanding, Granted	847,000	160,000
Number of Common Shares, Options Outstanding, Exercised	(19,989)	(159,626)
Number of Common Shares, Options Outstanding, Cancelled	(16,459)
Number of Common Shares, Options Outstanding, End of year	4,213,033	2,419,903
Number of Common Shares, Exercisable
Number of Common Shares Exercisable	391,040	564,903	411,029	724,529
Number of Common Shares, Available for Grant
Number of Common Shares, Available for Grant, beginning of year	274,596	837,635
Number of Common Shares, Available for Grant, Authorized	889,259	874,709
Number of Common Shares, Available for Grant, Granted	(847,000)	(160,000)
Number of Common Shares, Available for Grant, Cancelled	16,459
Number of Common Shares, Available for Grant, end of year	333,314	1,552,344
Weighted Average Exercise Price
Weighted Average Exercise Price, beginning of year	$ 9.02	$ 8.16
Weighted Average Exercise Price, Granted	13.36	10.53
Weighted Average Exercise Price, Exercised	7.70	10.24
Weighted Average Exercise Price, Cancelled	10.48
Weighted Average Exercise Price, end of year	$ 9.90	$ 8.49