Shareholders' Equity (Details 4) - Stock Options [Member]	12 Months Ended
	Dec. 31, 2016 $ / shares shares
Summary of options outstanding by exercise price range
Options Outstanding, Number of Shares Underlying Options	12,250
Options Exercisable, Number Exercisable	681
Range one [Member]
Summary of options outstanding by exercise price range
Options Outstanding, Exercise Price | $ / shares	$ 12.00
Options Outstanding, Number of Shares Underlying Options	1,000
Options Outstanding, Weighted Average Remaining Contractual Life	4 years 10 months 2 days
Options Exercisable, Number Exercisable	56
Options Exercisable, Exercise Price | $ / shares	$ 12.00
Range two [Member]
Summary of options outstanding by exercise price range
Options Outstanding, Exercise Price | $ / shares	$ 20.00
Options Outstanding, Number of Shares Underlying Options	11,250
Options Outstanding, Weighted Average Remaining Contractual Life	4 years 10 months 2 days
Options Exercisable, Number Exercisable	625
Options Exercisable, Exercise Price | $ / shares	$ 20.00