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12. Commitments & Contingent Liabilities Assumptions for Benefit Obligations and Periodic Benefit Costs (Tables) | 12 Months Ended
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Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |
Schedule of Assumptions Used [Table Text Block] | Assumptions The weighted-average assumptions used in computing the benefit obligations are as follows:
| 2017 | 2016
Discount rate | 0.8 | % | 0.9 | %
Compensation rate increase | 1.8 | % | 1.6 | %
The weighted-average assumptions used in computing the net periodic benefit costs are as follows:
| 2017 | 2016 | 2015
Discount rate | 0.9 | % | 1.1 | % | 1.3 | %
Expected long-term rate of return on plan assets | 1.9 | % | 1.6 | % | 2.3 | %

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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 Tabular disclosure of the assumptions used to determine for pension plans and/or other employee benefit plans the benefit obligation and net benefit cost, including assumed discount rates, rate increase in compensation increase, and expected long-term rates of return on plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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