General Commitments (Narrative) (Details) - USD ($) $ in Thousands  | 
Aug. 02, 2018  | 
Jul. 28, 2020  | 
|---|---|---|
| Other Commitments [Line Items] | ||
| Sale of building, purchase agreement, consideration amount | $ 10,000 | |
| Purchase Agreement [Member] | ||
| Other Commitments [Line Items] | ||
| Earnest money in escrow transferred to Company | $ 225 | 
| X | ||||||||||
- Definition Restricted Cash Transferred to Company No definition available. 
  | 
| X | ||||||||||
- Definition Sale of Property, Purchase Agreement, Consideration Amount No definition available. 
  | 
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available. 
  | 
| X | ||||||||||
- Details 
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