Note 15 - Net (Loss) Income Per Share of Common Stock (Detail) - Basic and Diluted Net (Loss) Income Per Share (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Net (loss) income (in Dollars)	$ (25,428)	$ 1,606	[1],[2],[3],[4]
Basic weighted-average common shares	190,461,696	184,413,923	[2],[4]
Options		28,000	[4]
Diluted weighted-average common shares	190,461,696	184,442,408	[2],[4]
Basic net (loss) income per share (in Dollars per share)	$ (0.13)	$ 0.01	[2],[4]
Diluted net (loss) income per share (in Dollars per share)	$ (0.13)	$ 0.01	[2],[4]

[1] As recast to reflect the balances of Solar Green Technology S.p.A. ("SGT") beginning January 1, 2011 combined with the balances of Solar Power, Inc. beginning March 31, 2011, as required under the accounting guidelines for a transfer of an entity under common control (refer to Note 5 -Acquisition of Solar Green Technology).

[2] As recast to reflect the balances of Solar Green Technology S.p.A. ("SGT") beginning January 1, 2011 combined with the balances of Solar Power, Inc. beginning March 31, 2011, as required under the accounting guidelines for a transfer of an entity under common control (refer to Note 5 -Acquisition of Solar Green Technology ).

[3] As recast to reflect the financial results of SGT beginning January 1, 2011 combined with the financial results of Solar Power, Inc. beginning March 31, 2011, as required under the accounting guidelines for a transfer of an entity under common control (see Note 5- Acquisition of Solar Green Technology).

[4] As recast to reflect the activity of SGT beginning January 1, 2011 combined with the balances of Solar Power, Inc. beginning March 31, 2011, as required under the accounting guidelines for a transfer of an entity under common control (refer to Note 5 -Acquisition of Solar Green Technology ).