Note 13 - Stock-based Compensation (Detail) - Stock Option Activities (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Vested and exercisable as of December 31, 2012	1,609,500
Vested and exercisable as of December 31, 2012 (in Dollars per share)	$ 0.64
Vested and exercisable as of December 31, 2012	2 years 237 days
Acquired in a transfer of an entity under common control (1)		2,505,175	[1]
Acquired in a transfer of an entity under common control (1) (in Dollars per share)		$ 0.92	[1]
Granted	2,620,000	4,890,000
Granted, weighted average exercise price per share (in Dollars per share)	$ 0.33	$ 0.44
Exercised	0	0
Exercised, weighted average exercise price per share (in Dollars per share)	$ 0	$ 0
Forfeited	(1,955,000)	(2,223,675)
Forfeited, weighted average exercise price per share (in Dollars per share)	$ 0.57	$ 0.71
Beginning of Period [Member]
Outstanding		0	[1]
Outstanding, weighted average exercise price per share (in Dollars per share)		$ 0	[1]
End of Period [Member]
Outstanding	5,836,500	5,171,500
Outstanding, weighted average exercise price per share (in Dollars per share)	$ 0.45	$ 0.56
Outstanding, weighted average remaining contractual term	3 years 6 months

[1] 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 ).