Note 10 - Reinsurance (Details Textual) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2025	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2022
Reinsurance Retention [Line Items]
Reinsurance, Amount Retained, Per Event	$ 1.5
Reinsurance Policy, Excess of Loss Protection Amount	735.0
Catastrophe Bond, Face Value	525.0	$ 420.0	$ 200.0	$ 275.0
Earthquake [Member]
Reinsurance Retention [Line Items]
Reinsurance, Amount Retained, Per Event	20.0
Reinsurance Policy, Excess of Loss Protection Amount	3,530.0
U.S. Hurricane [Member]
Reinsurance Retention [Line Items]
Reinsurance Policy, Excess of Loss Protection Amount	100.0
Continental Hurricane [Member]
Reinsurance Retention [Line Items]
Reinsurance, Amount Retained, Per Event	$ 11.0