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13. Legal Proceedings Legal Proceedings (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Feb. 26, 2019 | Dec. 31, 2017
Legal Proceedings [Abstract] |  |
Loss Contingency, Damages Sought, Value |  | $ 10,920,000
Litigation Settlement Interest |  | $ 141,608
Subsequent Event [Member] |  |
Subsequent Event [Line Items] |  |
Loss Contingency Accrual, Period Increase (Decrease) | $ (2,960,000) |
Loss Contingency, Damages Awarded, Value | $ 7,960,000 |

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- Definition Interest expense (income) directly attributable to an award in settlement of litigation. + References No definition available. + Details
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- Definition Amount of increase (decrease) in loss contingency liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349 + Details
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- Definition Amount of damages awarded to the plaintiff in the legal matter. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14557-108349 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349 + Details
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