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Long-Term Debt (Details) - 2012 Debenture - 9½% Subordinated Debentures Due 2012 [Member] - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Long-Term Debt (Details) - 2012 Debenture [Line Items]    
Long-term Debt $ 220,000 $ 220,000
Interest Payable, Current $ 232,000 $ 211,000
Debt Instrument, Maturity Date Dec. 01, 2012