Stock Option Plan, Equity Incentive Plan & Charter Amendment - Nonvested Share Activity (Details) - Employee Stock Options and Stock Appreciation Rights (SARs) [Member]	3 Months Ended
	Mar. 31, 2017 $ / shares shares
Shares
Non-vested options and SARs at January 1, 2017 (in shares) | shares	170,294
Granted (in shares) | shares	105,833
Vested (in shares) | shares	(5,115)
Forfeited (in shares) | shares	(322)
Non-vested options and SARs at March 31, 2017 (in shares) | shares	270,690
Weighted Average Grant Date Fair Value
Non-vested options and SARs at January 1, 2017 (in dollars per share) | $ / shares	$ 10.63
Granted (in dollars per share) | $ / shares	11.70
Vested (in dollars per share) | $ / shares	5.99
Forfeited (in dollars per share) | $ / shares	1.61
Non-vested options and SARs at March 31, 2017 (in dollars per share) | $ / shares	$ 11.51