Note 1 - Summary of Significant Accounting Policies (Details) - Assets and Liabilities at Fair Value on a Recurring Basis (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Level 1:
Unrealized gains	$ 1	$ 16
Unrealized losses		12
Short-term marketable securities	1,763	6,305
Long-term marketable securities		5,546
US Government Corporations and Agencies Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Level 1:
Adjusted cost	332	544
Unrealized losses		(1)
Fair value	332	543
Short-term marketable securities	332
Long-term marketable securities		543
Domestic Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Level 1:
Adjusted cost	1,354	4,915
Unrealized gains	1	1
Unrealized losses		(11)
Fair value	1,355	4,905
Short-term marketable securities	1,355	2,745
Long-term marketable securities		2,160
Municipal Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Level 1:
Adjusted cost	76	5,728
Unrealized gains		15
Fair value	76	5,743
Short-term marketable securities	76	2,900
Long-term marketable securities		2,843
Subtotal [Member] | Fair Value, Inputs, Level 2 [Member]
Level 1:
Adjusted cost	1,762	11,344
Unrealized gains	1	16
Unrealized losses		(12)
Fair value	1,763	11,348
Short-term marketable securities	1,763	5,802
Long-term marketable securities		5,546
Total [Member]
Level 1:
Adjusted cost	7,224	13,813
Unrealized gains	1	16
Unrealized losses		(12)
Fair value	7,225	13,817
Cash and cash equivalents	5,462	1,966
Short-term marketable securities	1,763	6,305
Long-term marketable securities		5,546
Asset-backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Level 1:
Adjusted cost		127
Fair value		127
Short-term marketable securities		127
Mortgage-backed Securities, Issued by Private Enterprises [Member] | Fair Value, Inputs, Level 2 [Member]
Level 1:
Adjusted cost		30
Fair value		30
Short-term marketable securities		30
Fair Value, Inputs, Level 1 [Member] | Cash [Member]
Level 1:
Adjusted cost	617	1,257
Fair value	617	1,257
Cash and cash equivalents	617	1,257
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member]
Level 1:
Adjusted cost	4,845	709
Fair value	4,845	709
Cash and cash equivalents	4,845	709
Fair Value, Inputs, Level 1 [Member] | Subtotal [Member]
Level 1:
Adjusted cost	5,462	2,469
Fair value	5,462	2,469
Cash and cash equivalents	5,462	1,966
Short-term marketable securities		503
Fair Value, Inputs, Level 1 [Member] | US Treasury Securities [Member]
Level 1:
Adjusted cost		503
Fair value		503
Short-term marketable securities		$ 503