Shareholders' Equity- Stock Options Activity (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Equity [Abstract]
Options Outstanding, Beginning Balance	15,000
Options Granted, Number of Shares	0
Stock options exercised, Shares	(9,500)
Options Forfeited or Expired, Number of Shares	0
Options Outstanding, Ending Balance	5,500	15,000
Option Exercisable, Number of Shares	5,500
Options Outstanding, Weighted Average Exercise Price, Beginning Balance	$ 16.88
Options Granted, Weighted Average Exercise Price	0.00
Options Exercised, Weighted Average Exercise Price	15.21
Options Forfeited or Expired in Period, Weighted Average Exercise Price	0.00
Options Outstanding, Weighted Average Exercise Price, Ending Balance	20.09	$ 16.88
Options Exercisable, Weighted Average Exercise Price	$ 20.09
Options Outstanding, Weighted Average Remaining Contractual Term	6 months	1 year
Options Exercisable, Weighted Average Remaining Contractual Term	6 months
Beginning Balance, Aggregate Intrinsic Value		$ 214,575
Ending Balance, Aggregate Intrinsic Value	$ 214,575
Options Exercisable, Aggregate Intrinsic Value	$ 140,470