Note 2 - Investments - Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands	Dec. 31, 2022		Jun. 30, 2022
Amortized cost	$ 8,246	[1]	$ 8,576
Amortized Cost	1,000
Investments in debt securities	8,127	[1]	$ 10,625
Fair Value, held to maturity debt securities, due after five years through ten years	$ 749

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