Financial Instruments (Details Textual) (USD $)	3 Months Ended			9 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Fair Value Disclosures [Abstract]
Impairment of Long-Lived Assets to be Disposed of		$ 687,000
Restricted Investments, at Fair Value	6,300,000			6,300,000
Financial Instruments (Textual) [Abstract]
Short-term investments contractual maturity period minimum	8			8
Maximum remaining maturities period of investments included in cash equivalents	3			3
Short-term investments contractual maturity period maximum	12			12
Average short-term investments maturity period	6			6
Goodwill, Impairment Loss		3,400,000		3,388,000	0
Assets Held-for-sale, Long Lived, Fair Value Disclosure	678,000			678,000
Impairment of Long-Lived Assets Held-for-use	4,409,000		0	4,409,000	0
Assets Held and Used, Long Lived, Fair Value Disclosure	0			0
FV of Goodwill, Grid	0			0
Loss on disposal of Grid business	$ 254,000			$ 254,000	$ 0