Note 6 - Cash, Cash Equivalents and Marketable Securities (Detail) - Summary of Investments With Unrealized Losses (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Jun. 30, 2012
Less Than 12 Months, Fair Value	$ 2,488	$ 4,127
Less Than 12 Months, Unrealized Loss	0	(1)
12 Months or Greater, Fair Value	3,973	4,270
12 Months or Greater, Unrealized Loss	(6)	(3)
Total, Fair Value	6,461	8,397
Total, Unrealized Loss	(6)	(4)
US Government Agencies Debt Securities [Member]
12 Months or Greater, Fair Value	548
12 Months or Greater, Unrealized Loss	(1)
Total, Fair Value	548
Total, Unrealized Loss	(1)
Corporate Debt Securities [Member]
Less Than 12 Months, Fair Value	2,488	1,696
Less Than 12 Months, Unrealized Loss	0	0
12 Months or Greater, Fair Value	3,425	901
12 Months or Greater, Unrealized Loss	(5)	(1)
Total, Fair Value	5,913	2,597
Total, Unrealized Loss	(5)	(1)
US Treasury and Government [Member]
Less Than 12 Months, Fair Value		2,262
Less Than 12 Months, Unrealized Loss		0
12 Months or Greater, Fair Value		1,015
12 Months or Greater, Unrealized Loss		(1)
Total, Fair Value		3,277
Total, Unrealized Loss		(1)
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Less Than 12 Months, Fair Value		169
Less Than 12 Months, Unrealized Loss		(1)
12 Months or Greater, Fair Value		2,354
12 Months or Greater, Unrealized Loss		(1)
Total, Fair Value		2,523
Total, Unrealized Loss		$ (2)