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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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Interest expense (income) directly attributable to an award in settlement of litigation.

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Amount of increase (decrease) in loss contingency liability.

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-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
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Amount of damages awarded to the plaintiff in the legal matter.

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The value (monetary amount) of the award the plaintiff seeks in the legal matter.

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Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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