Stockholders' Equity - Exercise Price (Details) - Stock Options	12 Months Ended
	Dec. 31, 2016 USD ($) $ / shares shares
Shareholders' Equity
Options Outstanding (in shares) | shares	567,602
Weighted Average Remaining Contractual Life	4 years 4 months 24 days
Weighted Average Exercise Price (in dollars per share)	$ 5.23
Options Exercisable (in shares) | shares	486,102
Weighted Average Exercise Price (in dollars per share)	$ 4.75
Intrinsic value
Intrinsic value related to options outstanding | $	$ 2,767,532
Intrinsic value related to vested options outstanding | $	$ 2,800,000
Closing stock price (in dollars per share)	$ 9.85
Exercise Price Range From Dollars 1.70 to Dollars 3.20
Shareholders' Equity
Exercise price, low end of range (in dollars per share)	1.70
Exercise price, high end of range (in dollars per share)	$ 2.40
Options Outstanding (in shares) | shares	173,600
Weighted Average Remaining Contractual Life	1 year 10 months 24 days
Weighted Average Exercise Price (in dollars per share)	$ 1.88
Options Exercisable (in shares) | shares	173,600
Weighted Average Exercise Price (in dollars per share)	$ 1.88
Exercise Price Range From Dollars 3.44 to Dollars 6.55
Shareholders' Equity
Exercise price, low end of range (in dollars per share)	3.44
Exercise price, high end of range (in dollars per share)	$ 6.55
Options Outstanding (in shares) | shares	218,550
Weighted Average Remaining Contractual Life	4 years 7 months 6 days
Weighted Average Exercise Price (in dollars per share)	$ 5.04
Options Exercisable (in shares) | shares	198,250
Weighted Average Exercise Price (in dollars per share)	$ 4.88
Exercise Price Range From Dollars 7.21 to Dollars 12.78
Shareholders' Equity
Exercise price, low end of range (in dollars per share)	7.21
Exercise price, high end of range (in dollars per share)	$ 12.78
Options Outstanding (in shares) | shares	153,800
Weighted Average Remaining Contractual Life	6 years 6 months
Weighted Average Exercise Price (in dollars per share)	$ 8.17
Options Exercisable (in shares) | shares	92,600
Weighted Average Exercise Price (in dollars per share)	$ 7.89
Exercise Price Range From Dollars 13.21 to Dollars 13.21
Shareholders' Equity
Exercise price, low end of range (in dollars per share)	13.21
Exercise price, high end of range (in dollars per share)	$ 13.21
Options Outstanding (in shares) | shares	21,652
Weighted Average Remaining Contractual Life	7 years 6 months
Weighted Average Exercise Price (in dollars per share)	$ 13.21
Options Exercisable (in shares) | shares	21,652
Weighted Average Exercise Price (in dollars per share)	$ 13.21