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Shareholders' Equity (Details 1) | 12 Months Ended
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Dec. 31, 2017 $ / shares shares
Options outstanding December 31, 2017 |
Number outstanding | shares | 679,552
Options exercisable at December 31, 2017 |
Number exercisable | shares | 254,850
Stock options [Member] | 2.71-3.90 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Minimum exercise price | $ 2.71
Maximum exercise price | $ 3.90
Options outstanding December 31, 2017 |
Number outstanding | shares | 25,000
Weighted average exercise price | $ 3.21
Weighted average remaining contractual life (In years) | 11 months 12 days
Options exercisable at December 31, 2017 |
Number exercisable | shares | 25,000
Weighted average exercise price | $ 3.21
Weighted average remaining contractual life (In years) | 11 months 12 days
Stock options [Member] | 5.35-8.60 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Minimum exercise price | $ 5.35
Maximum exercise price | $ 8.60
Options outstanding December 31, 2017 |
Number outstanding | shares | 47,800
Weighted average exercise price | $ 6.87
Weighted average remaining contractual life (In years) | 1 year 6 months 29 days
Options exercisable at December 31, 2017 |
Number exercisable | shares | 47,800
Weighted average exercise price | $ 6.87
Weighted average remaining contractual life (In years) | 1 year 6 months 29 days
Stock options [Member] | 10.49 - 14.52 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Minimum exercise price | $ 10.49
Maximum exercise price | $ 14.52
Options outstanding December 31, 2017 |
Number outstanding | shares | 427,750
Weighted average exercise price | $ 11.87
Weighted average remaining contractual life (In years) | 3 years 1 month 24 days
Options exercisable at December 31, 2017 |
Number exercisable | shares | 182,050
Weighted average exercise price | $ 12.19
Weighted average remaining contractual life (In years) | 2 years 8 months 26 days
Stock options [Member] | 18.90-19.85 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Minimum exercise price | $ 18.90
Maximum exercise price | $ 19.85
Options outstanding December 31, 2017 |
Number outstanding | shares | 179,002
Weighted average exercise price | $ 19.48
Weighted average remaining contractual life (In years) | 4 years 7 months 13 days
Options exercisable at December 31, 2017 |
Number exercisable | shares |
Weighted average exercise price |

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- Definition 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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