Computation of Net Loss from Continuing Operations per Share of Common Stock Components of Net Loss From Continuing Operations Per Basic and Diluted Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Weighted average shares outstanding – basic	9,499	9,347	9,232
Net loss	$ (3,617)	$ (11,724)	$ (11,175)
Warrants	(161)	0	(137)
Loss attributable to common shareholders	$ (3,778)	$ (11,724)	$ (11,312)
Weighted average shares outstanding – diluted (shares)	9,606	9,347	9,232
Net loss per share – diluted	$ (0.39)	$ (1.25)	$ (1.23)
Net loss per share – basic	$ (0.38)	$ (1.25)	$ (1.21)
Warrants
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Incremental common shares attributable to dilutive effect of call options and warrants	107	0	0