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Convertible Subordinated Notes (5 Year Maturity For Convertible Subordinated Notes) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Sep. 09, 2020
Debt Instrument [Line Items]
Amortization of debt issuance costs	$ 782,000	$ 392,000	$ 532,000
Discount Amortization, 2018	(20,000)
Discount Amortization, 2019	0
Discount Amortization, 2022	0
Subordinated Notes, Discount Accretion, Year Four	0
Subordinated Notes, Discount Accretion, Year Five	0
Subordinated Notes, Discount Accretion, After Year Five	0
Discount Amortization, Total	(20,000)
Convertible subordinated notes
Debt Instrument [Line Items]
Amortization of debt issuance costs	20,000	24,000	245,000
2021	2,559,000
2022	0
2023	0
2024	0
2025	0
Thereafter	0
Principal amount	2,559,000	6,319,000		$ 2,600,000
Convertible Subordinated Notes Aggregate Maturity, After Year Five	0
Discount Amortization, Total	(20,000)	(319,000)
Present Value, 2018	2,539,000
Present Value, 2019	0
Present Value, 2022	0
Convertible Subordinated Notes Aggregate Maturity, Year Four	0
Convertible Subordinated Notes Aggregate Maturity, Year Five	0
Carrying value of the liability component	2,539,000
Interest expense	149,000	174,000	1,878,000
Accretion of discount	$ 216,000	$ 241,000	$ 2,192,000

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