Summary of Significant Accounting Policies (Details Textual) (USD $)	3 Months Ended	6 Months Ended
	Jun. 25, 2011	Jun. 25, 2011	Jun. 30, 2012	Dec. 31, 2011
Summary of significant accounting policies (Textual) [Abstract]
Net of allowance for doubtful accounts			$ 200,000	$ 500,000
Issue of shares of common stock excluded from computation	2,035,000	1,804,000
Deferred revenue			6,900,000	6,600,000
Deferred profit			4,159,000	2,821,000	[1]
Accumulated other comprehensive loss			$ 2,349,000	$ 12,000	[1]

[1] Derived from December 31, 2011 audited financial statements.