Note 13 - Stock-based Compensation (Detail) - Assumptions Used in the Determination of Fair Value of Share-Based Payment Awards	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Expected term	3 years 9 months	5 years
Risk-free interest rate			[1]
Expected volatility			[1]
Expected dividend yield	0.00%	0.00%	[1]
Minimum [Member]
Expected term		3 years	[1]
Risk-free interest rate	0.60%	0.90%	[1]
Expected volatility	101.00%	132.00%	[1]
Maximum [Member]
Expected term		3 years 9 months	[1]
Risk-free interest rate	0.89%	1.52%	[1]
Expected volatility	103.00%	204.00%	[1]

[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 ).