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Shareholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2017
Shareholders' Equity [Abstract] |
Schedule of stock option activity and related information |
|  |  | 2017 |  |  | 2016 |  |  | 2015 |
|  |  | Number of options |  |  | Weighted- average exercise price |  |  | Number of options |  |  | Weighted average exercise price |  |  | Number of options |  |  | Weighted- average exercise price |
| Outstanding - beginning of year |  |  | 252,670 |  |  | $ | 6.21 |  |  |  | 238,894 |  |  | $ | 6.65 |  |  |  | 136,256 |  |  | $ | 9.62 |
| Changes during the year: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Granted |  |  | 75,000 |  |  | $ | 2.13 |  |  |  | 30,000 |  |  | $ | 2.13 |  |  |  | 109,625 |  |  | $ | 2.78 |
| Exercised |  |  | - |  |  | $ | - |  |  |  | (10,000 | ) |  | $ | 2.96 |  |  |  | - |  |  | $ | - |
| Forfeited |  |  | (13,545 | ) |  | $ | 49.09 |  |  |  | (6,224 | ) |  | $ | 8.56 |  |  |  | (6,987 | ) |  | $ | 12.49 |
| Outstanding - year end |  |  | 314,125 |  |  | $ | 3.39 |  |  |  | 252,670 |  |  | $ | 6.21 |  |  |  | 238,894 |  |  | $ | 6.65 |
| Vested and expected to vest |  |  | 192,584 |  |  | $ | 4.10 |  |  |  | 154,333 |  |  | $ | 8.44 |  |  |  | 88,766 |  |  | $ | 12.47 |
| Exercisable at year end |  |  | 182,584 |  |  | $ | 4.17 |  |  |  | 144,333 |  |  | $ | 8.82 |  |  |  | 88,766 |  |  | $ | 12.47 |
Schedule of options granted to employees and directors |
|  |  |  |  |  |  |  |  |  |  |  |  | Weighted average |
|  |  |  | Options |  |  | Weighted |  |  | Options |  |  | Remaining |
|  |  |  | outstanding |  |  | average |  |  | exercisable |  |  | Contractual |
|  |  |  | as of |  |  | remaining |  |  | as of |  |  | life of options |
| Exercise |  |  | December 31, |  |  | contractual |  |  | December 31, |  |  | exercisable |
| Price |  |  | 2017 |  |  | life (years) |  |  | 2017 |  |  | (years) |
|  | 2.126 |  |  |  | 30,000 |  |  |  | 3.86 |  |  |  | 10,002 |  |  |  | 3.86 |
|  | 2.131 |  |  |  | 75,000 |  |  |  | 4.93 |  |  |  | - |  |  |  | - |
|  | 2.237 |  |  |  | 26,625 |  |  |  | 2.81 |  |  |  | 17,749 |  |  |  | - |
|  | 2.96 |  |  |  | 73,000 |  |  |  | 2.38 |  |  |  | 45,333 |  |  |  | 3.38 |
|  | 3.88 |  |  |  | 375 |  |  |  | 1.88 |  |  |  | 375 |  |  |  | 1.88 |
|  | 3.88 |  |  |  | 90,000 |  |  |  | 0.85 |  |  |  | 90,000 |  |  |  | 0.85 |
|  | 4.02 |  |  |  | 5,000 |  |  |  | 1.54 |  |  |  | 5,000 |  |  |  | 1.54 |
|  | 6.67 |  |  |  | 10,000 |  |  |  | 1.28 |  |  |  | 10,000 |  |  |  | 1.28 |
|  | 6.67 |  |  |  | 375 |  |  |  | 1.28 |  |  |  | 375 |  |  |  | 1.28 |
|  | 33.60 |  |  |  | 3,750 |  |  |  | 0.23 |  |  |  | 3,750 |  |  |  | 0.23 |
|  | Grand Total |  |  |  | 314,125 |  |  |  | 2.65 |  |  |  | 182,584 |  |  |  | 1.63 |

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- Definition Tabular disclosure for share-based compensation plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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