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Note 10 - Commitments and Contingencies (Detail) (USD $)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 76 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Sep. 29, 2011
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Jun. 30, 2013
Oct. 25, 2012
Waste Heat Solutions
Oct. 25, 2012
Shares 500,000
Waste Heat Solutions
Mar. 31, 2013
Consulting Agreement
Feb. 28, 2013
Consulting Agreement
Mar. 31, 2013
Consulting Agreement
Jun. 30, 2013
Consulting Agreement
Dec. 31, 2012
Consulting Agreement
Intercompany agreements, description On September 29, 2011, the Company entered into a license agreement (the "License Agreement") with Newton Investments BV. Pursuant to the License Agreement, Newton will, for a period of 10 years, hold the exclusive manufacturing and distribution rights for the Systems in the 27 countries which are currently members of the European Union, subject to Newton's achieving minimum sales of at least 100 Systems per year beginning in the second year of the License Agreement, payment of a royalty equal to 20% of the gross sales price of each System sold, and other terms and conditions set forth in the License Agreement. Due to ongoing technical problems with the Company's Systems, the Company has deferred commencement of the minimum sales requirement until the problems are resolved.                          
Intercompany agreement royalty rate 20.00%                          
Consulting fee                   $ 7,500 $ 5,000      
Period of option in year                     10 years      
Number of warrants issued in connection with this consulting agreement                 500,000            
Exercise price of warrants                 $ 0.56            
Fair value of the fully vested option recorded as general and administrative expenses   189,827 271,433 642,504 492,672   4,292,934             182,000
Fair value of the fully vested option recorded as research and development expense   $ 77,405 $ 295,251 $ 313,562 $ 872,287   $ 3,642,456         $ 91,000 $ 30,300 $ 182,000
Consulting agreement and terms                 On October 25, 2012, the Company entered into a consulting agreement with Hank Leibowitz, the principal of Waste Heat Solutions, LLC, an expert with 40 years' experience in the field of advanced energy systems. Pursuant to this consulting agreement, which is terminable by either party on 30 days' notice, the Company pays Waste Heat Solutions, $5,000 per month through February 2013 and $7,500 per month thereafter. In connection with this consulting agreement, the Company issued to Waste Heat Solutions (i) a fully vested 10-year option to purchase 500,000 shares of common stock at $.56 per share and (ii) a 10-year option, vesting six months from the contract date, i.e., on April 25, 2013, to purchase an additional 500,000 shares at $.56 per share. The fair value of the fully vested option was approximately $182,000 and was recorded as general and administrative expenses in the consolidated statements of operations during 2012. The fair value of the option vesting six months from the contract date was approximately $182,000 of which approximately $91,000 was recorded as research and development expense in the condensed consolidated statements of operations for the first quarter 2013. The remaining $30,300 was recognized in the second quarter of 2013