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Leases And Commitments (Narrative) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
ft²
Dec. 31, 2019
USD ($)
Sep. 30, 2020
USD ($)
Leases And Commitments [Line Items]      
Rent expense $ 100 $ 100  
Operating lease right-of-use assets 295 90 $ 316
Operating lease liability 293   $ 316
Leases, discount rate     3.25%
Right-of-use assets exchange for operating lease liabilities   0  
Cash paid for operating lease liabilities $ 99 $ 95  
Austin [Member]      
Leases And Commitments [Line Items]      
Office space | ft² 6,000    
Lease expiration date Apr. 30, 2024