Note 11 - Fair Value Measurement (Details) - Assets Measured at Fair Value on a Recurring Basis - USD ($) $ in Thousands	Jun. 30, 2015	Jun. 30, 2014
Note 11 - Fair Value Measurement (Details) - Assets Measured at Fair Value on a Recurring Basis [Line Items]
Fair Value	$ 81,212	$ 26,764
US Treasury Securities [Member]
Note 11 - Fair Value Measurement (Details) - Assets Measured at Fair Value on a Recurring Basis [Line Items]
Fair Value	47,770	7,973
Corporate Debt Securities [Member]
Note 11 - Fair Value Measurement (Details) - Assets Measured at Fair Value on a Recurring Basis [Line Items]
Fair Value	13,152	16,310
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Note 11 - Fair Value Measurement (Details) - Assets Measured at Fair Value on a Recurring Basis [Line Items]
Fair Value	18,669
US States and Political Subdivisions Debt Securities [Member]
Note 11 - Fair Value Measurement (Details) - Assets Measured at Fair Value on a Recurring Basis [Line Items]
Fair Value	412	427
Mutual Fund Investments [Member]
Note 11 - Fair Value Measurement (Details) - Assets Measured at Fair Value on a Recurring Basis [Line Items]
Fair Value	1,209	1,261
Equity Securities [Member]
Note 11 - Fair Value Measurement (Details) - Assets Measured at Fair Value on a Recurring Basis [Line Items]
Fair Value		793
Fair Value, Inputs, Level 1 [Member]
Note 11 - Fair Value Measurement (Details) - Assets Measured at Fair Value on a Recurring Basis [Line Items]
Fair Value	48,979	10,027
Fair Value, Inputs, Level 1 [Member] | US Treasury Securities [Member]
Note 11 - Fair Value Measurement (Details) - Assets Measured at Fair Value on a Recurring Basis [Line Items]
Fair Value	47,770	7,973
Fair Value, Inputs, Level 1 [Member] | Mutual Fund Investments [Member]
Note 11 - Fair Value Measurement (Details) - Assets Measured at Fair Value on a Recurring Basis [Line Items]
Fair Value	1,209	1,261
Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member]
Note 11 - Fair Value Measurement (Details) - Assets Measured at Fair Value on a Recurring Basis [Line Items]
Fair Value		793
Fair Value, Inputs, Level 2 [Member]
Note 11 - Fair Value Measurement (Details) - Assets Measured at Fair Value on a Recurring Basis [Line Items]
Fair Value	32,233	16,737
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member]
Note 11 - Fair Value Measurement (Details) - Assets Measured at Fair Value on a Recurring Basis [Line Items]
Fair Value	13,152	16,310
Fair Value, Inputs, Level 2 [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Note 11 - Fair Value Measurement (Details) - Assets Measured at Fair Value on a Recurring Basis [Line Items]
Fair Value	18,669
Fair Value, Inputs, Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member]
Note 11 - Fair Value Measurement (Details) - Assets Measured at Fair Value on a Recurring Basis [Line Items]
Fair Value	$ 412	$ 427