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Shareholders' Equity (Details 1) - Stock options [Member]	6 Months Ended
	Jun. 30, 2018 $ / shares shares
Options outstanding at June 30, 2018
Number outstanding | shares	477,710
Options exercisable at June 30, 2018
Number exercisable | shares	164,208
5.35-6.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price, Minimum	$ 5.35
Exercise price, Maximum	$ 6.00
Options outstanding at June 30, 2018
Number outstanding | shares	10,400
Weighted average exercise price	$ 5.49
Weighted average remaining contractual life	8 months 12 days
Options exercisable at June 30, 2018
Number exercisable | shares	10,400
Weighted average exercise price	$ 5.49
Weighted average remaining contractual life	8 months 12 days
11.12-14.52 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price, Minimum	$ 11.12
Exercise price, Maximum	$ 14.52
Options outstanding at June 30, 2018
Number outstanding | shares	294,558
Weighted average exercise price	$ 11.79
Weighted average remaining contractual life	2 years 9 months
Options exercisable at June 30, 2018
Number exercisable | shares	153,808
Weighted average exercise price	$ 11.82
Weighted average remaining contractual life	2 years 6 months 7 days
18.90-19.85 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price, Minimum	$ 18.90
Exercise price, Maximum	$ 19.85
Options outstanding at June 30, 2018
Number outstanding | shares	172,752
Weighted average exercise price	$ 19.47
Weighted average remaining contractual life	4 years 1 month 9 days
Options exercisable at June 30, 2018
Number exercisable | shares
Weighted average exercise price
Weighted average remaining contractual life	0 years

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

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-Publisher FASB
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-Topic 718
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-Paragraph 2
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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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Weighted average remaining contractual term of exercisable stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

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