Consolidated Balance Sheets (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Allowance for doubtful accounts (in Dollars)	$ 393	$ 115	[1]
Preferred stock par value (in Dollars per share)	$ 0.0001	$ 0.0001	[1]
Preferred stock, shares authorized	20,000,000	20,000,000	[1]
Preferred stock, shares issued	0	0	[1]
Preferred stock, shares outstanding	0	0	[1]
Common stock par value (in Dollars per share)	$ 0.0001	$ 0.0001	[1]
Common stock, shares authorized	250,000,000	250,000,000	[1]
Common stock, shares issued	198,214,456	184,413,923	[1]
Common stock, shares outstanding	198,214,456	184,413,923	[1]

[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).