Note 4 - Investments - Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands		Jun. 30, 2022		Jun. 30, 2021
Amortized cost	[1]	$ 8,576	[2]	$ 8,741
Net Carrying Amount, held to maturity debt securities, due after five years through ten years		1,000
Investments in debt securities	[1]	10,625	[2]	$ 17,049
Fair Value, held to maturity debt securities, due after five years through ten years		$ 867

[1] Changes in unrealized gains and losses are included in the statement of comprehensive income (loss), except for embedded derivatives. Changes in unrealized and realized gains and losses for embedded derivatives are included in earnings in the statement of operations.

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