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