Note 11 - Fair Value Measurement: (Detail) - Assets Measured at Fair Value on a Recurring Basis: (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Jun. 30, 2011
Corporate Debt Securities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Company assets	$ 61,174	$ 60,082
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Company assets	61,174	60,082
US States and Political Subdivisions Debt Securities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Company assets	443	887
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Company assets	443	887
Mutual Fund Investments [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Company assets	1,423	1,208
Mutual Fund Investments [Member] | Fair Value, Inputs, Level 1 [Member]
Company assets	1,423	1,208
Equity Securities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Company assets	557	527
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Company assets	557	527
Estimate of Fair Value, Fair Value Disclosure [Member]
Company assets	63,597	62,704
Fair Value, Inputs, Level 1 [Member]
Company assets	1,980	1,735
Fair Value, Inputs, Level 2 [Member]
Company assets	$ 61,617	$ 60,969