Note 12 - Segment Information (Details) - Total Assets by Segment (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Jun. 30, 2013	Sep. 30, 2012	Jun. 30, 2012
Cash and marketable securities:
Cash and cash equivalents	$ 1,645	$ 1,966	$ 8,241	$ 7,381
Marketable securities	10,172	11,851
Total cash and marketable securities	11,817	13,817
Power supplies and storage:
Power supplies and Storage	5,974	6,390
Total assets	17,781	20,207
Power Supplies [Member]
Power supplies and storage:
Power supplies and Storage	(367)	538
Storage [Member]
Power supplies and storage:
Power supplies and Storage	$ 6,331	$ 5,852