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Leases And Commitments (Narrative) (Details)
 12 Months Ended
Dec. 31, 2022
USD ($)
ft²
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Leases And Commitments [Line Items]        
Rent expense $ 100,000 $ 100,000 $ 100,000  
Operating lease right-of-use assets 122,000 210,000   $ 316,000
Operating lease liability 139,000     $ 316,000
Leases, discount rate       3.25%
Right-of-use assets exchange for operating lease liabilities 0 0    
Cash paid for operating lease liabilities $ 155,000 $ 109,000 $ 99,000  
Austin, Texas [Member]        
Leases And Commitments [Line Items]        
Office space | ft² 6,000      
Lease expiration date Apr. 30, 2024      
Austin, Texas [Member] | Short-Term Operating Lease [Member]        
Leases And Commitments [Line Items]        
Office space | ft² 3,600      
Lease expiration date Oct. 31, 2022