Note 4 - Investments - Investments With Fair Values Adjusted on Recurring Basis (Details) - USD ($) $ in Thousands		Jun. 30, 2024		Jun. 30, 2023
Equity Securities, FV-NI		$ 10,885		$ 13,205
Total investments in trading securities:		11,093		13,205
Investments in debt securities	[1]	4,414
Corporate Debt Securities [Member]
Corporate debt securities, fair value		208		0
Convertible Debt Securities [Member]
Investments in debt securities		4,414		7,008
Fair Value, Recurring [Member]
Total investments carried at fair value		15,507		20,213
Fair Value, Nonrecurring [Member]
Total investments carried at fair value		600	[2]	1,786	[3]
Equity Securities International [Member]
Equity Securities, FV-NI		435		778
Equity Securities International [Member] | Fair Value, Recurring [Member]
Equity Securities, FV-NI		435		778
Mutual Funds Fixed Income [Member]
Equity Securities, FV-NI		9,644		11,642
Mutual Funds Fixed Income [Member] | Fair Value, Recurring [Member]
Equity Securities, FV-NI		9,644		11,642
Mutual Funds Global Equity [Member]
Equity Securities, FV-NI		806		785
Mutual Funds Global Equity [Member] | Fair Value, Recurring [Member]
Equity Securities, FV-NI		806		785
Fair Value, Inputs, Level 1 [Member]
Equity Securities, FV-NI		10,885		12,915
Total investments in trading securities:		11,093		12,915
Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member]
Corporate debt securities, fair value		208		0
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		11,093		12,915
Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member]
Total investments carried at fair value		0	[2]	0	[3]
Fair Value, Inputs, Level 1 [Member] | Equity Securities International [Member] | Fair Value, Recurring [Member]
Equity Securities, FV-NI		435		488
Fair Value, Inputs, Level 1 [Member] | Mutual Funds Fixed Income [Member] | Fair Value, Recurring [Member]
Equity Securities, FV-NI		9,644		11,642
Fair Value, Inputs, Level 1 [Member] | Mutual Funds Global Equity [Member] | Fair Value, Recurring [Member]
Equity Securities, FV-NI		806		785
Fair Value, Inputs, Level 2 [Member]
Equity Securities, FV-NI		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		0	[2]	0	[3]
Fair Value, Inputs, Level 2 [Member] | Equity Securities International [Member] | Fair Value, Recurring [Member]
Equity Securities, FV-NI		0		0
Fair Value, Inputs, Level 2 [Member] | Mutual Funds Fixed Income [Member] | Fair Value, Recurring [Member]
Equity Securities, FV-NI		0		0
Fair Value, Inputs, Level 2 [Member] | Mutual Funds Global Equity [Member] | Fair Value, Recurring [Member]
Equity Securities, FV-NI		0		0
Fair Value, Inputs, Level 3 [Member]
Equity Securities, FV-NI		0		290
Total investments in trading securities:		0		290
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		4,414		7,008
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Total investments carried at fair value		4,414		7,298
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member]
Total investments carried at fair value		600	[2]	1,786	[3]
Fair Value, Inputs, Level 3 [Member] | Equity Securities International [Member] | Fair Value, Recurring [Member]
Equity Securities, FV-NI		0		290
Fair Value, Inputs, Level 3 [Member] | Mutual Funds Fixed Income [Member] | Fair Value, Recurring [Member]
Equity Securities, FV-NI		0		0
Fair Value, Inputs, Level 3 [Member] | Mutual Funds Global Equity [Member] | Fair Value, Recurring [Member]
Equity Securities, FV-NI		$ 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.

[3] Fair value information is not as of June 30, 2023. 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, 2023. These securities are classified as level 3 due to the infrequency of the observable price changes and/or restrictions on the shares.