Note 3 - Investments - Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands		Dec. 31, 2023		Jun. 30, 2023
Amortized Cost		$ 7,056	[1]	$ 7,729
Amortized Cost		1,000
Investments in debt securities	[1]	5,784
Fair Value, held to maturity debt securities, due after five years through ten years		$ 823

[1] Principal payments of $750,000 are due quarterly with a final maturity date in January 2026.