Note 3 - Investments - Investments With Fair Values Adjusted on Recurring Basis (Details) - USD ($) $ in Thousands		Jun. 30, 2025	Jun. 30, 2024
Fair value		$ 12,126	$ 10,885
Total investments in trading securities:		12,188	11,093
Investments in debt securities	[1]	1,576
Corporate Debt Securities [Member]
Corporate debt securities, fair value		62	208
Convertible Debt Securities [Member]
Investments in debt securities		1,576	4,414
Fair Value, Recurring [Member]
Total investments carried at fair value		13,764	15,507
Fair Value, Nonrecurring [Member]
Total investments carried at fair value	[2]	189	600
Equity Securities Domestic [Member]
Fair value		27	0
Equity Securities Domestic [Member] | Fair Value, Recurring [Member]
Fair value		27	0
Equity Securities International [Member]
Fair value		426	435
Equity Securities International [Member] | Fair Value, Recurring [Member]
Fair value		426	435
Exchange Traded Funds Crypto and Digital Asset [Member]
Fair value		997	0
Exchange Traded Funds Crypto and Digital Asset [Member] | Fair Value, Recurring [Member]
Fair value		997	0
Exchange Traded Funds Global Equity [Member]
Fair value		32	0
Exchange Traded Funds Global Equity [Member] | Fair Value, Recurring [Member]
Fair value		32	0
Exchange Traded Funds Option Strategy and Income [Member]
Fair value		111	0
Exchange Traded Funds Option Strategy and Income [Member] | Fair Value, Recurring [Member]
Fair value		111	0
Mutual Funds Fixed Income [Member]
Fair value		9,692	9,644
Mutual Funds Fixed Income [Member] | Fair Value, Recurring [Member]
Fair value		9,692	9,644
Mutual Funds Global Equity [Member]
Fair value		841	806
Mutual Funds Global Equity [Member] | Fair Value, Recurring [Member]
Fair value		841	806
Fair Value, Inputs, Level 1 [Member]
Fair value		12,126	10,885
Total investments in trading securities:		12,188	11,093
Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member]
Corporate debt securities, fair value		62	208
Fair Value, Inputs, Level 1 [Member] | Convertible Debt Securities [Member]
Investments in debt securities		0	0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Total investments carried at fair value		12,188	11,093
Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member]
Total investments carried at fair value	[2]	0	0
Fair Value, Inputs, Level 1 [Member] | Equity Securities Domestic [Member] | Fair Value, Recurring [Member]
Fair value		27	0
Fair Value, Inputs, Level 1 [Member] | Equity Securities International [Member] | Fair Value, Recurring [Member]
Fair value		426	435
Fair Value, Inputs, Level 1 [Member] | Exchange Traded Funds Crypto and Digital Asset [Member] | Fair Value, Recurring [Member]
Fair value		997	0
Fair Value, Inputs, Level 1 [Member] | Exchange Traded Funds Global Equity [Member] | Fair Value, Recurring [Member]
Fair value		32	0
Fair Value, Inputs, Level 1 [Member] | Exchange Traded Funds Option Strategy and Income [Member] | Fair Value, Recurring [Member]
Fair value		111	0
Fair Value, Inputs, Level 1 [Member] | Mutual Funds Fixed Income [Member] | Fair Value, Recurring [Member]
Fair value		9,692	9,644
Fair Value, Inputs, Level 1 [Member] | Mutual Funds Global Equity [Member] | Fair Value, Recurring [Member]
Fair value		841	806
Fair Value, Inputs, Level 2 [Member]
Fair value		0	0
Total investments in trading securities:		0	0
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member]
Corporate debt securities, fair value		0	0
Fair Value, Inputs, Level 2 [Member] | Convertible Debt Securities [Member]
Investments in debt securities		0	0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Total investments carried at fair value		0	0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member]
Total investments carried at fair value	[2]	0	0
Fair Value, Inputs, Level 2 [Member] | Equity Securities Domestic [Member] | Fair Value, Recurring [Member]
Fair value		0	0
Fair Value, Inputs, Level 2 [Member] | Equity Securities International [Member] | Fair Value, Recurring [Member]
Fair value		0	0
Fair Value, Inputs, Level 2 [Member] | Exchange Traded Funds Crypto and Digital Asset [Member] | Fair Value, Recurring [Member]
Fair value		0	0
Fair Value, Inputs, Level 2 [Member] | Exchange Traded Funds Global Equity [Member] | Fair Value, Recurring [Member]
Fair value		0	0
Fair Value, Inputs, Level 2 [Member] | Exchange Traded Funds Option Strategy and Income [Member] | Fair Value, Recurring [Member]
Fair value		0	0
Fair Value, Inputs, Level 2 [Member] | Mutual Funds Fixed Income [Member] | Fair Value, Recurring [Member]
Fair value		0	0
Fair Value, Inputs, Level 2 [Member] | Mutual Funds Global Equity [Member] | Fair Value, Recurring [Member]
Fair value		0	0
Fair Value, Inputs, Level 3 [Member]
Fair value		0	0
Total investments in trading securities:		0	0
Fair Value, Inputs, Level 3 [Member] | Corporate Debt Securities [Member]
Corporate debt securities, fair value		0	0
Fair Value, Inputs, Level 3 [Member] | Convertible Debt Securities [Member]
Investments in debt securities		1,576	4,414
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Total investments carried at fair value		1,576	4,414
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member]
Total investments carried at fair value	[2]	189	600
Fair Value, Inputs, Level 3 [Member] | Equity Securities Domestic [Member] | Fair Value, Recurring [Member]
Fair value		0	0
Fair Value, Inputs, Level 3 [Member] | Equity Securities International [Member] | Fair Value, Recurring [Member]
Fair value		0	0
Fair Value, Inputs, Level 3 [Member] | Exchange Traded Funds Crypto and Digital Asset [Member] | Fair Value, Recurring [Member]
Fair value		0	0
Fair Value, Inputs, Level 3 [Member] | Exchange Traded Funds Global Equity [Member] | Fair Value, Recurring [Member]
Fair value		0	0
Fair Value, Inputs, Level 3 [Member] | Exchange Traded Funds Option Strategy and Income [Member] | Fair Value, Recurring [Member]
Fair value		0	0
Fair Value, Inputs, Level 3 [Member] | Mutual Funds Fixed Income [Member] | Fair Value, Recurring [Member]
Fair value		0	0
Fair Value, Inputs, Level 3 [Member] | Mutual Funds Global Equity [Member] | Fair Value, Recurring [Member]
Fair value		$ 0	$ 0

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

[2] Fair value information is not as of June 30, 2024. Other investments include equity securities without readily determinable fair values that were adjusted as a result of the measurement alternative during the year ended June 30, 2024. These securities are classified as level 3 due to the infrequency of the observable price changes and/or restrictions on the shares.