Shareholders' Equity (Details 4)	6 Months Ended
	Jun. 30, 2017 $ / shares shares
Summary of options outstanding by exercise price range
Options Outstanding, Number of Shares Underlying Options	12,250
Options Outstanding, Weighted Average Remaining Contractual Life	4 years 4 months 6 days
Options Exercisable, Number Exercisable	2,722
Stock Options [Member] | 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 4 months 6 days
Options Exercisable, Number Exercisable	222
Options Exercisable, Exercise Price | $ / shares	$ 12.00
Stock Options [Member] | 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 4 months 6 days
Options Exercisable, Number Exercisable	2,500
Options Exercisable, Exercise Price | $ / shares	$ 20.00