Segment Information (Continuing Operating Segments) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) segment	Dec. 31, 2014 USD ($)
Net revenues	$ 7,636	$ 7,041
Interest income	0	2
Depreciation and amortization	348	209
Interest expense	11	17
Purchase of property and equipment	70	46
Total assets	13,421	13,764
Income before income taxes	$ 1,744	1,554
Number of reportable segments | segment	2
Foreign Country Revenue [Member]
Net revenues	$ 972	973
Production Monitoring [Member]
Net revenues	7,636	7,041
Interest income	0	0
Depreciation and amortization	348	209
Interest expense	11	17
Purchase of property and equipment	70	46
Total assets	4,998	4,945
Income before income taxes	295	389
Production Monitoring [Member] | Foreign Country Revenue [Member]
Net revenues	972	973
ESI Investment Company [Member]
Interest income	0	2
Total assets	8,423	8,819
Income before income taxes	$ 1,449	$ 1,165