Note 3 - Supplemental Balance Sheet Information (Detail) (USD $)	12 Months Ended		3 Months Ended
Dec. 31, 2012	Mar. 31, 2013	Mar. 31, 2013 One Year [Member]
Unbilled Retainage and Fees		$ 600,000
Unbilled Receivables, Current	0.6
Billing Period	1 year		1 year
Other Unbilled Receivable	$ 1,500,000

The amount due for services rendered or products shipped, but not yet billed, recognized in conformity with revenue recognition criteria. This element is distinct from unbilled contracts receivables because this is based on noncontract transactions.

No definition available.

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