Note 12 - Segment Information (Details) - Total Assets by Segment (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Jun. 30, 2013	Mar. 31, 2013	Jun. 30, 2012
Cash and marketable securities:
Cash and cash equivalents	$ 4,823	$ 1,966	$ 825	$ 7,381
Marketable securities	2,917	11,851
Total cash and marketable securities	7,740	13,817
Other assets:
Total other assets	6,072	6,390
Total assets	13,812	20,207
Power Supplies [Member]
Other assets:
Power supplies and Storage	2,529	2,893
Storage [Member]
Other assets:
Power supplies and Storage	$ 3,543	$ 3,497