Long-Term Debt (Details) - 2012 Note - USD ($)		3 Months Ended		6 Months Ended
	Jan. 15, 2021	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Long-Term Debt (Details) - 2012 Note [Line Items]
Long-term Debt		$ 2,954,000		$ 2,954,000		$ 2,815,000
Gain (Loss) on Extinguishment of Debt				77,000
8¼% Limited Convertible Senior Subordinated Notes Due 2012 [Member]
Long-Term Debt (Details) - 2012 Note [Line Items]
Long-term Debt		302,000		$ 302,000		352,000
Debt Instrument, Maturity Date				Mar. 01, 2012
Interest Payable, Current		$ 295,000		$ 295,000		$ 329,000
Debt Instrument, Face Amount	$ 50,000
Debt Exchange Each Principal Amount Of Original Debt Exchanged	1,000
Repayment Of Convertible Debt Principal	400
Debt Exchanged Aggregate Payment	$ 20,000