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Commitments and Contingent Liabilities (Schedule of Future Minimum Operating Lease) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Minimum Lease Payments, Sale Leaseback Transactions, Fiscal Year Maturity [Abstract] |  |  |
2021 |  | $ 600 |
2022 |  | 800 |
2023 |  | 800 |
2024 |  | 800 |
2025 |  | 800 |
Thereafter |  | 3,600 |
Total Lease Payments |  | 7,400 |
Imputed Interest |  | (1,800) |
Present Value of Lease Payments |  | 5,600 |
Less Current Portion | [1] | (700) |
Non-Current Lease Liability |  | $ 4,872 | $ 5,042
[1] | Included in Other Current Liabilities

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