Note 3 - Investments - Components of Investments (Details) - USD ($) $ in Thousands		12 Months Ended
		Jun. 30, 2026		Jun. 30, 2025		Mar. 31, 2026	Jun. 30, 2024
Cost				$ 12,748
Unrealized gains (losses)				(622)
Fair value				12,126
Total trading securities at fair value, cost		$ 13,006		12,963
Total trading securities at fair value, Unrealized gains (losses)		(1,262)		(775)
Total trading securities at fair value		11,744		12,188
Corporate debt securities, Unrealized gains (losses)	[1]	0		(146)
Amortized cost		0		3,993
Debt Securities, Available-for-Sale, Total						$ 0
Allowance for credit losses		0		0
Corporate debt securities, amortized cost	[2]	1,000		1,000
Corporate debt securities, allowance for credit losses		(28)	[2]	(52)	[2]		$ (132)
Corporate debt securities, net carrying amount	[2]	972		948
Corporate debt securities, gross unrecognized holding gains	[2]	0		0
Corporate debt securities, gross unrecognized holding losses	[2]	0		0
Corporate debt securities, fair value	[2]	972		948
Convertible Debt Securities [Member]
Amortized cost				3,993
Debt Securities, Available-for-Sale, Total				1,576
Allowance for credit losses				0
Convertible Debt Securities [Member] | Other Comprehensive Income (Loss) [Member]
Gross unrealized gains in other comprehensive income (loss)				125
Unrealized loss				0
Convertible Debt Securities [Member] | Net Investment Income (Loss) [Member]
Unrealized loss	[3]			(2,542)
Corporate Debt Securities [Member]
Corporate debt securities, cost				215
Corporate debt securities, Unrealized gains (losses)				(153)
Corporate debt securities, fair value				62
Equity Securities Domestic [Member]
Cost		87		87
Unrealized gains (losses)		(33)		(60)
Fair value		54		27
Equity Securities International [Member]
Cost		976		761
Unrealized gains (losses)		(203)		(335)
Fair value		773		426
Exchange Traded Funds Crypto and Digital Asset [Member]
Cost		1,579		967
Unrealized gains (losses)		(660)		30
Fair value		919		997
Exchange Traded Funds Global Equity [Member]
Cost		30		30
Unrealized gains (losses)		15		2
Fair value		45		32
Exchange Traded Funds Option Strategy and Income [Member]
Cost		341		105
Unrealized gains (losses)		(85)		6
Fair value		256		111
Mutual Funds Fixed Income [Member]
Cost		9,064		9,869
Unrealized gains (losses)		(193)		(177)
Fair value		8,871		9,692
Mutual Funds Global Equity [Member]
Cost		929		929
Unrealized gains (losses)		(103)		(88)
Fair value		$ 826		$ 841

[1] In December 2025, senior notes were mandatorily exchanged for equity securities of the issuer pursuant to a court-approved restructuring. Accordingly, the investment is presented within equity securities at the reporting date, and prior-period amounts are reflected within debt securities classified as trading. The exchange was a non-cash, nonrecognition transaction.

[2] Held-to-maturity debt investments are carried at amortized cost, net of allowance for credit losses, and the fair value is classified as Level 2 according to the fair value hierarchy.

[3] Represents changes in unrealized gains and losses related to embedded derivatives included within net investment income (loss) on the Consolidated Statements of Operations.