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Leased Assets (Schedule of right-of-use assets and related lease liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Operating Leased Assets [Line Items]    
Right-of-use assets $ 2,124 $ 2,610
Operating lease liabilities    
Noncurrent portion 1,724 $ 2,176
Total operating lease liabilities $ 2,175  
Weighted average remaining lease term of operating leases 11 years 6 months  
Other Assets [Member]    
Operating Leased Assets [Line Items]    
Right-of-use assets $ 2,124  
Trade accounts payable and accrued expenses [Member]    
Operating lease liabilities    
Current portion $ 451