Note 2 - Investments - Investments With Fair Values Adjusted on Recurring Basis (Details) - USD ($) $ in Thousands		Dec. 31, 2024		Jun. 30, 2024
Fair value		$ 10,791		$ 10,885
Total investments in trading securities:		10,950		11,093
Investments in debt securities	[1]	3,037
Corporate Debt Securities [Member]
Corporate debt securities, fair value		159		208
Convertible Debt Securities [Member]
Investments in debt securities		3,037		4,414
Fair Value, Recurring [Member]
Total investments carried at fair value		13,987		15,507
Fair Value, Nonrecurring [Member]
Total investments carried at fair value		0	[2]	600	[3]
Equity Securities International [Member]
Fair value		326		435
Equity Securities International [Member] | Fair Value, Recurring [Member]
Fair value		326		435
Exchange Traded Funds Global Equity [Member]
Fair value		5
Mutual Funds Fixed Income [Member]
Fair value		9,671		9,644
Mutual Funds Fixed Income [Member] | Fair Value, Recurring [Member]
Fair value		9,671		9,644
Mutual Funds Global Equity [Member]
Fair value		789		806
Mutual Funds Global Equity [Member] | Fair Value, Recurring [Member]
Fair value		789		806
Fair Value, Inputs, Level 1 [Member]
Fair value		10,791		10,885
Total investments in trading securities:		10,950		11,093
Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member]
Corporate debt securities, fair value		159		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		10,950		11,093
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]
Fair value		326		435
Fair Value, Inputs, Level 1 [Member] | Exchange Traded Funds Global Equity [Member]
Fair value		5
Fair Value, Inputs, Level 1 [Member] | Mutual Funds Fixed Income [Member] | Fair Value, Recurring [Member]
Fair value		9,671		9,644
Fair Value, Inputs, Level 1 [Member] | Mutual Funds Global Equity [Member] | Fair Value, Recurring [Member]
Fair value		789		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		0	[2]	0	[3]
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 Global Equity [Member]
Fair value		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		3,037		4,414
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Total investments carried at fair value		3,037		4,414
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member]
Total investments carried at fair value		0	[2]	600	[3]
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 Global Equity [Member]
Fair value		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] Other investments include equity securities without readily determinable fair values that are adjusted as a result of the measurement alternative. There were no adjustments during the six months ended December 31, 2024.

[3] Other investments include equity securities without readily determinable fair values that were adjusted as a result of the measurement alternative on dates during the fiscal 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.