Amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. Excludes amounts related to receivables held-for-sale.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.10(3))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 10

-Subparagraph 3

-Article 9

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

Note 6 - Note Receivable (Detail) (USD $)	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Subsequent Event [Member] Solar Hub [Member]	Mar. 31, 2013 EPC Contract [Member]	Dec. 31, 2012 EPC Contract [Member]	Jun. 08, 2012 Solar Hub [Member] Maximum [Member]	Mar. 31, 2013 Solar Hub [Member]	Dec. 31, 2012 Solar Hub [Member]	Apr. 27, 2012 Solar Hub [Member]
Note Receivable, Interest Rate			10.00%	5.00%
Financing Receivable, Net	$ 7,007,000	$ 14,120,000		$ 7,000,000	$ 7,000,000		$ 7,900,000	$ 7,100,000
Financing Receivable, Gross						$ 9,000,000			$ 1,000,000