Note 12 - Segment Information (Details) - Total Assets by Segment (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012
Cash and Marketable Securities:
Cash and cash equivalents	$ 1,922	$ 1,966	$ 6,482	$ 7,381
Marketable securities	8,487	11,851
Total Cash and Marketable Securities	10,409	13,817
Power supplies and Storage:
Power supplies and Storage	6,277	6,390
Total assets	16,686	20,207
Power Supplies [Member]
Power supplies and Storage:
Power supplies and Storage	149	538
Storage [Member]
Power supplies and Storage:
Power supplies and Storage	$ 6,128	$ 5,852