Commitments, Contingencies and Other (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Loss Contingencies [Line Items]
Aggregate amount in legal matters	$ 900,000
Interest expense	54,000
Health claim reinsurance limit per employee	50,000
Expense for self-insurance claims	1,308,000	$ 876,000
Accrual for self-insurance claims	69,000
BMO Harris Bank and Texas Capital Bank [Member]
Loss Contingencies [Line Items]
Available lines of credit	15,000,000
Interest expense	$ 18,000	$ 29,000