Consolidated Statements of Changes in Stockholders' Equity (Deficit) - USD ($) shares in Thousands	Preferred Stock [Member]	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balance, beginning of year and end of year (in shares)	949	12,808
Balance, beginning of year and end of year (in shares) at Dec. 31, 2017	949	12,808
Balance, beginning of year and end of year at Dec. 31, 2017	$ 1,843,000	$ 128,000		$ 56,518,000	$ (61,529,000)	$ (107,000)
Exercise of stock options (in shares)		451					451
Balance, end of year (in shares) at Dec. 31, 2018	949	13,259	(362)	56,609
Exercise of stock options		$ 5,000		$ 163,000
Balance, end of year at Dec. 31, 2018	$ 1,843,000	$ 133,000		$ 56,609,000	(59,242,000)	(43,000)	$ (1,062,000)
Balance, beginning of year and end of year (in shares)	949	12,808	(362)	56,609
Stock-based compensation				$ 20,000
Preferred stock dividends declared, net of waived penalties by shareholders				$ (92,000)
Net income					2,287,000		2,287,000
Extinguishment of U.K. cumulative translation adjustment						64,000	$ 64,000
Balance, beginning of year and end of year (in shares)	949	13,259	(362)	56,609
Exercise of stock options (in shares)		293					294
Balance, end of year (in shares) at Dec. 31, 2019		13,552	(362)	56,759
Exercise of stock options		$ 3,000		$ 236,000
Balance, end of year at Dec. 31, 2019		$ 136,000			(54,777,000)	(43,000)	$ 3,556,000
Balance, beginning of year and end of year (in shares)	949	13,552	(362)	56,609
Stock-based compensation				$ 47,000
Preferred stock dividends declared, net of waived penalties by shareholders				$ (133,000)
Net income					$ 4,465,000		4,465,000
Extinguishment of U.K. cumulative translation adjustment
Balance, beginning of year and end of year (in shares)		13,552	(362)	56,759