Note 2 - Investments - Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands	Sep. 30, 2022		Jun. 30, 2022
Amortized cost	$ 8,433	[1]	$ 8,576
Net Carrying Amount, held to maturity debt securities, due after five years through ten years	1,000
Investments in debt securities	10,686	[1]	$ 11,449
Fair Value, held to maturity debt securities, due after five years through ten years	$ 798

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