Note 3 - Investments - Investments With Fair Values Adjusted on Recurring Basis (Details) - USD ($) $ in Thousands		Jun. 30, 2026		Mar. 31, 2026	Jun. 30, 2025
Fair value					$ 12,126
Total investments in trading securities:		$ 11,744			12,188
Investments in debt securities				$ 0
Corporate Debt Securities [Member]
Corporate debt securities, fair value					62
Convertible Debt Securities [Member]
Investments in debt securities					1,576
Fair Value, Recurring [Member]
Total investments carried at fair value		11,744			13,764
Fair Value, Nonrecurring [Member]
Total investments carried at fair value	[1]	3,913	[2]		189
Equity Securities Domestic [Member]
Fair value		54			27
Equity Securities Domestic [Member] | Fair Value, Recurring [Member]
Fair value		54			27
Equity Securities International [Member]
Fair value		773			426
Equity Securities International [Member] | Fair Value, Recurring [Member]
Fair value		773			426
Exchange Traded Funds Crypto and Digital Asset [Member]
Fair value		919			997
Exchange Traded Funds Crypto and Digital Asset [Member] | Fair Value, Recurring [Member]
Fair value		919			997
Exchange Traded Funds Global Equity [Member]
Fair value		45			32
Exchange Traded Funds Global Equity [Member] | Fair Value, Recurring [Member]
Fair value		45			32
Exchange Traded Funds Option Strategy and Income [Member]
Fair value		256			111
Exchange Traded Funds Option Strategy and Income [Member] | Fair Value, Recurring [Member]
Fair value		256			111
Mutual Funds Fixed Income [Member]
Fair value		8,871			9,692
Mutual Funds Fixed Income [Member] | Fair Value, Recurring [Member]
Fair value		8,871			9,692
Mutual Funds Global Equity [Member]
Fair value		826			841
Mutual Funds Global Equity [Member] | Fair Value, Recurring [Member]
Fair value		826			841
Fair Value, Inputs, Level 1 [Member]
Fair value					12,126
Total investments in trading securities:					12,188
Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member]
Corporate debt securities, fair value					62
Fair Value, Inputs, Level 1 [Member] | Convertible Debt Securities [Member]
Investments in debt securities					0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Total investments carried at fair value		11,744			12,188
Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member]
Total investments carried at fair value	[1]	0	[2]		0
Fair Value, Inputs, Level 1 [Member] | Equity Securities Domestic [Member] | Fair Value, Recurring [Member]
Fair value		54			27
Fair Value, Inputs, Level 1 [Member] | Equity Securities International [Member] | Fair Value, Recurring [Member]
Fair value		773			426
Fair Value, Inputs, Level 1 [Member] | Exchange Traded Funds Crypto and Digital Asset [Member] | Fair Value, Recurring [Member]
Fair value		919			997
Fair Value, Inputs, Level 1 [Member] | Exchange Traded Funds Global Equity [Member] | Fair Value, Recurring [Member]
Fair value		45			32
Fair Value, Inputs, Level 1 [Member] | Exchange Traded Funds Option Strategy and Income [Member] | Fair Value, Recurring [Member]
Fair value		256			111
Fair Value, Inputs, Level 1 [Member] | Mutual Funds Fixed Income [Member] | Fair Value, Recurring [Member]
Fair value		8,871			9,692
Fair Value, Inputs, Level 1 [Member] | Mutual Funds Global Equity [Member] | Fair Value, Recurring [Member]
Fair value		826			841
Fair Value, Inputs, Level 2 [Member]
Fair value					0
Total investments in trading securities:					0
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member]
Corporate debt securities, fair value					0
Fair Value, Inputs, Level 2 [Member] | Convertible Debt Securities [Member]
Investments in debt securities					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	[1]	0	[2]		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
Total investments in trading securities:					0
Fair Value, Inputs, Level 3 [Member] | Corporate Debt Securities [Member]
Corporate debt securities, fair value					0
Fair Value, Inputs, Level 3 [Member] | Convertible Debt Securities [Member]
Investments in debt securities					1,576
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Total investments carried at fair value		0			1,576
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member]
Total investments carried at fair value	[1]	3,913	[2]		189
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] Fair value information is not presented as of June 30, 2025. Other investments include equity securities without readily determinable fair values that were adjusted under the measurement alternative during the year ended June 30, 2025. These investments are classified within Level 3 of the fair value hierarchy due to the limited availability of observable market data and the infrequency of observable price changes.

[2] Other investments include equity securities without readily determinable fair values that were adjusted under the measurement alternative during the nine months ended March 31, 2026. These securities are classified within level 3 due to the infrequency of the observable price changes and, in certain cases, restrictions on the transferability of the shares.