Note 2 - Investments - Reconciliation of Investments Recorded at Fair Value (Details) (Parentheticals) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Dec. 31, 2024	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2024	Dec. 31, 2023
Income Statement [Abstract]
Investment Income, Net	$ 354		$ 1,416		$ 1,271	$ 903
Statement Of Other Comprehensive Income Abstract [Domain]
Other Comprehensive Income (Loss), Net of Tax	$ (134)	$ (142)	$ (171)	$ (214)	$ (276)	$ (385)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Investment Income, Net
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration]	Other Comprehensive Income (Loss), Net of Tax