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Note 15 - Income Taxes (Detail) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Income Tax Expense (Benefit) $ 9,000 $ (179,000) [1]  
Effective Income Tax Rate, Continuing Operations (0.30%) 14.00%  
Unrecognized Tax Benefits $ 0   $ 0
[1] As recast to reflect the financial results of SGT, combined with the financial results of Solar Power, Inc. as required under the accounting guidelines for a transfer of an entity under common control (refer to Note 5 -Acquisition of Solar Green Technology ).