Note 5 - Collaborative Agreements (Detail) (USD $)	3 Months Ended	6 Months Ended			0 Months Ended	3 Months Ended	0 Months Ended	1 Months Ended
	Nov. 25, 2012	Nov. 25, 2012	Nov. 27, 2011	May 27, 2013 Scenario, Forecast [Member]	Dec. 01, 2006 Monsanto [Member]	Nov. 27, 2011 Monsanto [Member]	Jun. 24, 2012 INCOTEC [Member]	Mar. 31, 2006 Air Products [Member]	Jun. 30, 2010 Windset [Member] Apio [Member]	Jun. 30, 2010 Minimum [Member]
License Agreement Term					5 years		7 years
Termination Fee					$ 4,000,000
Licenses Revenue			2,700,000			1,350,000
Royalty Percentage							20.00%
License Agreement Profit Percentage								40.00%
Development Fee									100,000
Annual License Fee Percentage									3.00%
Annual Minimum License Fees										150,000
Research and Development Arrangement, Contract to Perform for Others, Compensation Earned	$ 103,000	$ 138,000		$ 550,000