Note 17 - Business Segment Information (Detail) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Number of Operating Segments	2
Entity Wide Revenue, Major Customer, Number	3	2
Entity-Wide Revenue, Major Customer, Percentage	10.00%	10.00%
Power And Energy Group [Member]
Deferred Revenue, Additions (in Dollars)	5,900,000
Property, Plant and Equipment, Gross, Period Increase (Decrease) (in Dollars)	(6,900,000)	180,401

Amount of deferred revenue recognized for transactions arising during the current reporting period. Deferred revenue is a liability as of the balance sheet date related to a revenue producing activity for which revenue has not yet been recognized. Generally, an Entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 605

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 13.A.4(a).Q1)

-URI http://asc.fasb.org/extlink&oid=6600647&loc=d3e214044-122780

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 13

-Section A

Name:	us-gaap_DeferredRevenueAdditions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration