Note 4 - Fair Value Measurement (Details) - Assets Measured at Fair Value on a Recurring Basis (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Jun. 30, 2014
Note 4 - Fair Value Measurement (Details) - Assets Measured at Fair Value on a Recurring Basis [Line Items]
Fair Value	$ 45,290	$ 26,764
Fair Value, Inputs, Level 1 [Member] | US Treasury Securities [Member]
Note 4 - Fair Value Measurement (Details) - Assets Measured at Fair Value on a Recurring Basis [Line Items]
Fair Value	26,817	7,973
Fair Value, Inputs, Level 1 [Member] | Mutual Fund Investments [Member]
Note 4 - Fair Value Measurement (Details) - Assets Measured at Fair Value on a Recurring Basis [Line Items]
Fair Value	1,216	1,261
Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member]
Note 4 - Fair Value Measurement (Details) - Assets Measured at Fair Value on a Recurring Basis [Line Items]
Fair Value	742	793
Fair Value, Inputs, Level 1 [Member]
Note 4 - Fair Value Measurement (Details) - Assets Measured at Fair Value on a Recurring Basis [Line Items]
Fair Value	28,775	10,027
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member]
Note 4 - Fair Value Measurement (Details) - Assets Measured at Fair Value on a Recurring Basis [Line Items]
Fair Value	11,133	16,310
Fair Value, Inputs, Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member]
Note 4 - Fair Value Measurement (Details) - Assets Measured at Fair Value on a Recurring Basis [Line Items]
Fair Value	424	427
Fair Value, Inputs, Level 2 [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Note 4 - Fair Value Measurement (Details) - Assets Measured at Fair Value on a Recurring Basis [Line Items]
Fair Value	4,958
Fair Value, Inputs, Level 2 [Member]
Note 4 - Fair Value Measurement (Details) - Assets Measured at Fair Value on a Recurring Basis [Line Items]
Fair Value	16,515	16,737
Corporate Debt Securities [Member]
Note 4 - Fair Value Measurement (Details) - Assets Measured at Fair Value on a Recurring Basis [Line Items]
Fair Value	11,133	16,310
US States and Political Subdivisions Debt Securities [Member]
Note 4 - Fair Value Measurement (Details) - Assets Measured at Fair Value on a Recurring Basis [Line Items]
Fair Value	424	427
US Treasury Securities [Member]
Note 4 - Fair Value Measurement (Details) - Assets Measured at Fair Value on a Recurring Basis [Line Items]
Fair Value	26,817	7,973
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Note 4 - Fair Value Measurement (Details) - Assets Measured at Fair Value on a Recurring Basis [Line Items]
Fair Value	4,958
Mutual Fund Investments [Member]
Note 4 - Fair Value Measurement (Details) - Assets Measured at Fair Value on a Recurring Basis [Line Items]
Fair Value	1,216	1,261
Equity Securities [Member]
Note 4 - Fair Value Measurement (Details) - Assets Measured at Fair Value on a Recurring Basis [Line Items]
Fair Value	$ 742	$ 793