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Note 6 - Note Receivable (Details) (USD $)
Jun. 30, 2013
Dec. 31, 2012
Apr. 27, 2012
Jun. 30, 2013
EPC Contract [Member]
Dec. 31, 2012
EPC Contract [Member]
Jun. 30, 2013
Solar Hub [Member]
Mar. 31, 2013
Solar Hub [Member]
Dec. 31, 2012
Solar Hub [Member]
Apr. 27, 2012
Solar Hub [Member]
Jun. 08, 2012
Solar Hub [Member]
Maximum [Member]
Note 6 - Note Receivable (Details) [Line Items]                    
Note Receivable, Interest Rate       5.00%     10.00%   6.00%  
Financing Receivable, Net $ 7,007,000 $ 14,120,000   $ 7,000,000 $ 7,000,000 $ 8,400,000   $ 7,100,000    
Notes, Loans and Financing Receivable, Net, Noncurrent 38,993,000     30,600,000            
Financing Receivable, Gross     $ 1,000,000           $ 1,000,000 $ 9,000,000