Sprint Nextel Asset Exchange (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012
Sprint Nextel Asset Exchange (Textual) [Abstract]
Gain recognized representing amount of substitute equipment currently in use including installation costs and net of assets disposed	$ 32,000	$ 2,100,000
Substitute equipment carrying amount	53,000		53,000
Deferred gain in other current liabilities			$ 53,000