Segment Information (Continuing Operating Segments) (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) segment	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($) segment
Net revenues	$ 1,837	$ 2,132	$ 5,562	$ 6,065
Interest income	3	4	18	6
Depreciation and amortization			235	264
Interest expense	0	3	1	9
Purchase of property and equipment			2	19
Total assets	13,138		13,138		$ 13,421
Income before income taxes	35	299	$ 117	1,911
Number of reportable segments | segment			1		2
Production Monitoring [Member]
Net revenues	1,837	2,132	$ 5,562	6,065
Income before income taxes	$ 35	295	$ 117	456
Segment Investments [Member]
Income before income taxes		$ 4		$ 1,455