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Note 18 - Concentration of Risk in Customer and Supplier Relationships (Tables) - Customer Concentration Risk [Member] | 12 Months Ended
--- | ---
Dec. 31, 2014
Sales Revenue, Goods, Net [Member] |
Note 18 - Concentration of Risk in Customer and Supplier Relationships (Tables) [Line Items] |
Schedules of Concentration of Risk, by Risk Factor [Table Text Block] |
|  | Years Ended December 31, |
|  | 2014 |  |  | 2013 |
Smart Energy Today |  |  | 13.3 | % |  |  | 13.5 | %
WDC Solar, Inc. |  |  | 12.0 | % |  |  | 14.7 | %
JCF Wholesale |  |  | 8.7 | % |  |  | 10.6 | %
Lowe’s |  |  | 5.9 | % |  |  | 6.9 | %
Sustainable Environmental Enterprises |  |  | 1.3 | % |  |  | 52.8 | %
Accounts Receivable [Member] |
Note 18 - Concentration of Risk in Customer and Supplier Relationships (Tables) [Line Items] |
Schedules of Concentration of Risk, by Risk Factor [Table Text Block] |
|  | December 31, |
|  | 2014 |  |  | 2013 |
WDC Solar, Inc. |  |  | 40.1 | % |  |  | — |
Lowe’s |  |  | 16.8 | % |  |  | — |
Sustainable Environmental Enterprises |  |  | — | % |  |  | 86.7 | %
Smart Energy Today |  |  | 6.5 | % |  |  | — |

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