Note 9 - Assets Held for Sale (Details) (USD $)	3 Months Ended	6 Months Ended			1 Months Ended		3 Months Ended	12 Months Ended
	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012	Jun. 30, 2012 Solar Facility [Member]	May 31, 2012 Solar Facility [Member]	Jun. 30, 2011 Solar Facility [Member]	Dec. 31, 2010 Solar Facility [Member]	Dec. 31, 2011 Solar Facility [Member]	Jan. 02, 2010 Solar Facility [Member]	Dec. 31, 2011 SEF [Member]
Note 9 - Assets Held for Sale (Details) [Line Items]
Assets Held-for-sale, Current		$ 0		$ 0				$ 6,700,000	$ 6,300,000	$ 10,000,000	$ 5,500,000
Impairment of Long-Lived Assets to be Disposed of								3,300,000
Asset Impairment Charges	712,000		712,000			700,000	400,000
Liabilities of Assets Held-for-sale					4,200,000
Proceeds from Sale of Property, Plant, and Equipment		$ 13,000	$ 409,000		$ 1,500,000