Segment Information (Tables)

12 Months Ended

Dec. 31, 2015

Segment Information [Abstract]

Financial Information Relating To Continuing Operating Segments

	2015		2014
Net revenues
Production Monitoring	$	7,636	$	7,041
Total		7,636		7,041
Sales in foreign countries
Production Monitoring		972		973
Total		972		973
Interest income
Production Monitoring		0		0
ESI Investment Company		0		2
Total		0		2
Depreciation and amortization expense
Production Monitoring		348		209
Total		348		209
Interest expense
Production Monitoring		11		17
Total		11		17
Capital purchases
Production Monitoring		70		46
Total		70		46
Total assets
Production Monitoring		4,998		4,945
ESI Investment Company		8,423		8,819
Total		13,421		13,764
Income before income taxes
Production Monitoring		295		389
ESI Investment Company		1,449		1,165
Total		1,744		1,554