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12. Legal Proceedings 12. Contingent Liability (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Feb. 26, 2019 | Dec. 31, 2018
Legal Proceedings [Abstract] |  |
Loss Contingency, Damages Awarded, Value | $ 7,960,000 | $ 10,920,000
Litigation Settlement Interest |  | $ 141,608
Loss Contingency Accrual, Period Increase (Decrease) | $ (2,960,000) |

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