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