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Shareholders' Equity (Details 1) - Stock Option [Member] | 12 Months Ended
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Dec. 31, 2017 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Options outstanding | 314,125
Weighted average remaining contractual life (years) | 2 years 7 months 24 days
Options exercisable | 182,584
Weighted average Remaining Contractual life of options exercisable (years) | 1 year 7 months 17 days
2.126 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise Price | $ / shares | $ 2.126
Options outstanding | 30,000
Weighted average remaining contractual life (years) | 3 years 10 months 10 days
Options exercisable | 10,002
Weighted average Remaining Contractual life of options exercisable (years) | 3 years 10 months 10 days
2.131 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise Price | $ / shares | $ 2.131
Options outstanding | 75,000
Weighted average remaining contractual life (years) | 4 years 11 months 4 days
Options exercisable |
2.237 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise Price | $ / shares | $ 2.237
Options outstanding | 26,625
Weighted average remaining contractual life (years) | 2 years 9 months 22 days
Options exercisable | 17,749
2.96 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise Price | $ / shares | $ 2.96
Options outstanding | 73,000
Weighted average remaining contractual life (years) | 2 years 4 months 17 days
Options exercisable | 45,333
Weighted average Remaining Contractual life of options exercisable (years) | 3 years 4 months 17 days
3.88 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise Price | $ / shares | $ 3.88
Options outstanding | 375
Weighted average remaining contractual life (years) | 1 year 10 months 17 days
Options exercisable | 375
Weighted average Remaining Contractual life of options exercisable (years) | 1 year 10 months 17 days
3.88 One [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise Price | $ / shares | $ 3.88
Options outstanding | 90,000
Weighted average remaining contractual life (years) | 10 months 6 days
Options exercisable | 90,000
Weighted average Remaining Contractual life of options exercisable (years) | 10 months 6 days
4.02 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise Price | $ / shares | $ 4.02
Options outstanding | 5,000
Weighted average remaining contractual life (years) | 1 year 6 months 14 days
Options exercisable | 5,000
Weighted average Remaining Contractual life of options exercisable (years) | 1 year 6 months 14 days
6.67 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise Price | $ / shares | $ 6.67
Options outstanding | 10,000
Weighted average remaining contractual life (years) | 1 year 3 months 11 days
Options exercisable | 10,000
Weighted average Remaining Contractual life of options exercisable (years) | 1 year 3 months 11 days
6.67 One [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise Price | $ / shares | $ 6.67
Options outstanding | 375
Weighted average remaining contractual life (years) | 1 year 3 months 11 days
Options exercisable | 375
Weighted average Remaining Contractual life of options exercisable (years) | 1 year 3 months 11 days
33.60 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise Price | $ / shares | $ 33.60
Options outstanding | 3,750
Weighted average remaining contractual life (years) | 2 months 23 days
Options exercisable | 3,750
Weighted average Remaining Contractual life of options exercisable (years) | 2 months 23 days

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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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- Definition 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. + 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)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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. + 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 (e)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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. + 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)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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