Note 8 - Property, Plant and Equipment (Detail) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012		Dec. 31, 2012
Property, Plant and Equipment, Net	$ 18,500,000			$ 18,754,000
Capital Leased Assets, Gross	5,900,000
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation	200,000
Depreciation	285,000	277,000	[1]
PV Solar Systems_Aerojet 1 [Member]
Property, Plant and Equipment, Net	$ 14,900,000

[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 ).