Accounts Receivable (Details Textual) (USD $)	Jun. 30, 2012	Dec. 31, 2011
Accounts Receivable (Textual) [Abstract]
U.S. government receivables unbilled amount	$ 4,217,000	$ 2,093,000

Unbilled amounts (net of unliquidated progress payments) of government contract receivables.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 912

-SubTopic 310

-Section 45

-Paragraph 9

-URI http://asc.fasb.org/extlink&oid=6471842&loc=d3e55376-109406

Name:	us-gaap_GovernmentContractReceivableUnbilledAmounts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant