Note 11 - Business Segment Information (Details) - Revenues and Accounts Receivable by Major Customers (Current Period) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenue, Major Customer [Line Items]
Sales	$ 3,152,000	$ 454,000	$ 5,006,000	$ 711,000
Hawaiian Electric Light Company [Member]
Revenue, Major Customer [Line Items]
Sales			2,149,000
Accounts Receivable	68,000		68,000
Vestas [Member]
Revenue, Major Customer [Line Items]
Sales			1,291,000
Accounts Receivable	179,000		179,000
Proterra, LLC [Member]
Revenue, Major Customer [Line Items]
Sales			485,000
Accounts Receivable	$ 83,000		$ 83,000