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Commitments, Contingencies and Other (Narrative) (Details) - USD ($) | 12 Months Ended
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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

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- Definition Amount of the cost of borrowed funds accounted for as interest expense for debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 + Details
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