Note 11 - Business Segment Information (Details) - Revenues and Accounts Receivable by Major Customers (Prior 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
Hybricon [Member]
Revenue, Major Customer [Line Items]
Sales				131,000
ABB Secheron [Member]
Revenue, Major Customer [Line Items]
Sales				98,000
Cargotec [Member]
Revenue, Major Customer [Line Items]
Sales				90,000
Bombardier [Member]
Revenue, Major Customer [Line Items]
Sales				79,000
Accounts Receivable		79,000		79,000
Ocean Power Technologies [Member]
Revenue, Major Customer [Line Items]
Sales				$ 74,000