Segment Information (Continuing Operating Segments) (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) segment	Jun. 30, 2015 USD ($)	Dec. 31, 2015 USD ($) segment
Net revenues	$ 2,009	$ 2,048	$ 3,725	$ 3,933
Interest income	4	1	15	2
Depreciation and amortization			157	177
Interest expense	0	2	1	6
Purchase of property and equipment			2	15
Total assets	13,153		13,153		$ 13,421
Income before income taxes	217	764	$ 82	1,612
Number of reportable segments | segment			1		2
Production Monitoring [Member]
Net revenues	2,009	2,048	$ 3,725	3,933
Income before income taxes	217	129	82	161
Segment Investments [Member]
Income before income taxes	$ 0	$ 635	$ 0	$ 1,451