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Cash Equivalents And Restricted Cash And Securities (Narrative) (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Restricted Cash and Cash Equivalents Items [Line Items]      
Restricted securities $ 494,000   $ 528,000
Restricted cash 1,972,000   2,000,000
Gross realized gains or losses on cash equivalents 0 $ 0  
Maturity Date Within Three Months [Member] | Money Market Funds [Member]      
Restricted Cash and Cash Equivalents Items [Line Items]      
Restricted securities $ 494,000   $ 528,000
Maximum [Member] | Maturity Date Within Three Months [Member] | Money Market Funds [Member] | Measurement Input, Expected Term [Member]      
Restricted Cash and Cash Equivalents Items [Line Items]      
Restricted securities maturity period 3 months   3 months