Note 6 - Note Receivable	6 Months Ended
Jun. 30, 2013
Receivables [Abstract]
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]	6. Notes Receivable The Company agreed to advance to one customer predevelopment and site acquisition costs related to EPC contracts between the customer and the Company and recorded the amount as notes receivable. The terms of the EPC agreement require repayment of the advance upon final completion of the SEF, which is expected to occur in the first half of 2014, and bears interest at the rate of 5% per year that is payable at the time the principal is repaid. The credit quality indicators considered related to this note receivable were the customer’s position as one of largest privately held independent power producers on the East Coast, their financial condition and forecast, and their credit history. At June 30, 2013 and December 31, 2012, the balance of the note receivable from this customer was $7.0 million and $7.0 million, respectively. These amounts are recorded in the current account notes receivable. During the second quarter of 2013, the Company converted certain accounts receivable from this same customer into notes receivable that are tied to the project as security interest in the event that the customer does not obtain debt term financing for their project. In that event, the Company would collect the cash payments from the waterfall operating cash. As a result of this conversion, the Company re-classified the accounts receivables to noncurrent notes receivable as of June 30, 2013 as the collection terms have been extended past one year. If the customer does obtain debt term financing for their project, the collection of these notes receivable may be accelerated. At June 30, 2013 and December 31, 2012, the balance recorded in noncurrent notes receivable related to this customer was $30.6 million and none, respectively. On April 27, 2012, the Company made a secured loan of $1.0 million to Solar Hub Utilities, LLC (“Solar Hub”), to be used for pre-development costs, and recorded the amount in notes receivable, noncurrent. On June 8, 2012, the Company agreed to advance Solar Hub up to $9.0 million under a new $9.0 million secured promissory note, which refinanced the original $1.0 million advance and bears a 6 percent annual interest rate. In March 2013, the interest was changed to a 10% annual interest rate in accordance with the Amended and Restated Secured Promissory Note. This note receivable is secured by the project assets. Repayment in full of all borrowed amounts was due on December 31, 2013 but, in March 2013, was extended to a new maturity date of July 1, 2014 in accordance with the Amended and Restated Secured Promissory Note. As of June 30, 2013 and December 31, 2012, the balance of the note receivable from Solar Hub was $8.4 million and $7.1 million, respectively. These amounts are recorded in notes receivable, noncurrent as of June 30, 2013 and notes receivable, a current account, as of December 31, 2012.

Note 6 - Note Receivable

6 Months Ended

Jun. 30, 2013

Loans, Notes, Trade and Other Receivables Disclosure [Text Block]

6. Notes Receivable

The Company agreed to advance to one customer predevelopment and site acquisition costs related to EPC contracts between the customer and the Company and recorded the amount as notes receivable. The terms of the EPC agreement require repayment of the advance upon final completion of the SEF, which is expected to occur in the first half of 2014, and bears interest at the rate of 5% per year that is payable at the time the principal is repaid. The credit quality indicators considered related to this note receivable were the customer’s position as one of largest privately held independent power producers on the East Coast, their financial condition and forecast, and their credit history. At June 30, 2013 and December 31, 2012, the balance of the note receivable from this customer was $7.0 million and $7.0 million, respectively. These amounts are recorded in the current account notes receivable.

During the second quarter of 2013, the Company converted certain accounts receivable from this same customer into notes receivable that are tied to the project as security interest in the event that the customer does not obtain debt term financing for their project. In that event, the Company would collect the cash payments from the waterfall operating cash. As a result of this conversion, the Company re-classified the accounts receivables to noncurrent notes receivable as of June 30, 2013 as the collection terms have been extended past one year. If the customer does obtain debt term financing for their project, the collection of these notes receivable may be accelerated. At June 30, 2013 and December 31, 2012, the balance recorded in noncurrent notes receivable related to this customer was $30.6 million and none, respectively.

On April 27, 2012, the Company made a secured loan of $1.0 million to Solar Hub Utilities, LLC (“Solar Hub”), to be used for pre-development costs, and recorded the amount in notes receivable, noncurrent. On June 8, 2012, the Company agreed to advance Solar Hub up to $9.0 million under a new $9.0 million secured promissory note, which refinanced the original $1.0 million advance and bears a 6 percent annual interest rate. In March 2013, the interest was changed to a 10% annual interest rate in accordance with the Amended and Restated Secured Promissory Note. This note receivable is secured by the project assets. Repayment in full of all borrowed amounts was due on December 31, 2013 but, in March 2013, was extended to a new maturity date of July 1, 2014 in accordance with the Amended and Restated Secured Promissory Note. As of June 30, 2013 and December 31, 2012, the balance of the note receivable from Solar Hub was $8.4 million and $7.1 million, respectively. These amounts are recorded in notes receivable, noncurrent as of June 30, 2013 and notes receivable, a current account, as of December 31, 2012.

- Definition

The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses.

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