Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Sales Leaseback (Details)

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Summary of Significant Accounting Policies - Sales Leaseback (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2015
Sale Leaseback Transaction [Line Items]      
Proceeds from sale of solar-PV projects $ 4,925,000 $ 7,581,000  
Capital lease assets 6,810,000   $ 6,810,000
Solar Photovaltaic Projects      
Sale Leaseback Transaction [Line Items]      
Maximum combined funding amount   50,000,000  
Percentage of fair value threshold integral equipment     10.00%
Sale leaseback transaction, deferred gain   $ 1,029,000  
Sale leaseback transaction, deferred loss $ 1,421,000   $ 1,421,000
Lease terms     P20Y
Solar Photovaltaic Projects | Minimum      
Sale Leaseback Transaction [Line Items]      
Monthly payments     $ 7,000
Solar Photovaltaic Projects | Maximum      
Sale Leaseback Transaction [Line Items]      
Monthly payments     $ 348,000