Note 12 - Segment Information (Detail) - Total Assets by Segment (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Jun. 30, 2012	Mar. 31, 2012	Jun. 30, 2011
Cash and cash equivalents	$ 825	$ 7,381	$ 3,777	$ 4,970
Marketable securities	15,920	13,504
Total cash and marketable securities	16,745	20,885
Power supplies and storage:
Power supplies and Storage	6,786	7,939
Total assets	23,531	28,824
Power Supplies [Member]
Power supplies and storage:
Power supplies and Storage	548	2,142
Storage [Member]
Power supplies and storage:
Power supplies and Storage	$ 6,238	$ 5,797