Note 1 - Restatement of Previously Issued Consolidated Financial Statements - Summary of Error Correction and Restatement of Financial Statements (Details) - USD ($)	3 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Jun. 30, 2022
Deferred tax asset	$ 1,373,000		$ 872,000
Investments in equity securities at fair value, non-current	2,243,000		2,162,000
Total Shareholders’ Equity	53,329,000	$ 56,061,000	54,164,000
Investment loss	(1,460,000)	(34,000)
Tax expense	79,000	514,000
Net Income	$ 107,000	$ 2,390,000
Earnings Per Share (in dollars per share)	$ 0.01	$ 0.16
Investments in securities at fair value	$ 9,866,000		10,625,000
Other comprehensive loss, net of tax, as restated	(486,000)	$ (635,000)
Cash and cash equivalents	23,287,000		22,314,000
Restricted cash	1,000,000		1,000,000
Investments in securities at fair value, current	11,963,000		12,138,000
Accounts and other receivables	1,576,000		1,796,000
Tax receivable	96,000		384,000
Prepaid expenses	312,000		400,000
Total Current Assets	38,234,000		38,032,000
Net Property and Equipment	1,320,000		1,370,000
Deferred tax asset	1,373,000		872,000
Investments in held-to-maturity debt securities	1,000,000		1,000,000
Other investments	2,630,000	3,453,000	3,992,000
Financing lease, right of use assets	86,000		93,000
Other assets, non-current	233,000		216,000
Total Other Assets	17,431,000		18,960,000
Total Assets	56,985,000	61,917,000	58,362,000
Accounts payable	14,000		73,000
Accrued compensation and related costs	1,925,000		1,864,000
Dividends payable	336,000		337,000
Financing lease liability, short-term	28,000		27,000
Other accrued expenses	1,137,000		1,831,000
Taxes payable	157,000		0
Total Current Liabilities	3,597,000		4,132,000
Financing lease liability, long-term	59,000		66,000
Total Long-Term Liabilities	59,000		66,000
Total Liabilities	3,656,000		4,198,000
Commitments and Contingencies (Note 13)
Additional paid-in-capital	16,440,000		16,438,000
Treasury stock, class A shares at cost; 1,014,031 shares and 978,049 shares at September 30, 2022, and June 30, 2022, respectively	2,722,000		2,599,000
Accumulated comprehensive income, net of tax	3,138,000		3,624,000
Retained earnings	36,074,000		36,302,000
Total Liabilities and Shareholders’ Equity	56,985,000		58,362,000
Revenues	4,412,000	6,521,000
Employee compensation and benefits	1,175,000	1,924,000
General and administrative	1,504,000	1,598,000
Advertising	86,000	84,000
Depreciation	61,000	48,000
Interest	1,000	0
Operating Expenses	2,827,000	3,654,000
Operating Income	1,585,000	2,867,000
Income from equity method investments	0	15,000
Other income	61,000	56,000
Nonoperating Income (Expense)	(1,399,000)	37,000
Income Before Income Taxes	$ 186,000	$ 2,904,000
Diluted Net Income per Share (in dollars per share)	$ 0.01	$ 0.16
Basic weighted average number of common shares outstanding (in shares)	14,948,688	15,030,115
Diluted weighted average number of common shares outstanding (in shares)	14,949,275	15,031,199
Unrealized losses on available-for-sale securities arising during period	$ (115,000)	$ (147,000)
Less: reclassification adjustment for gains included in net income	(371,000)	(476,000)
Net change from available-for-sale securities, net of tax	(486,000)	(623,000)
Foreign currency translation adjustment	0	(12,000)
Comprehensive Income (Loss)	(379,000)	1,755,000
Balance	54,164,000	54,324,000
Purchases of shares of Common Stock (class A)	(133,000)	(82,000)
Issuance of stock under ESPP of shares of Common Stock (class A)	13,000	14,000
Share-based compensation, adjustment for forfeitures, net of tax	(1,000)
Dividends declared	(335,000)	(338,000)
Balance	53,329,000	56,061,000
Depreciation, amortization and accretion	(77,000)	(129,000)
Net recognized loss on disposal of fixed assets	3,000	0
Net realized gains on securities	(469,000)	(2,411,000)
Unrealized losses on securities	1,930,000	2,796,000
Net income from equity method investment	0	(15,000)
Provision for deferred taxes	(371,000)	(905,000)
Stock-based compensation expense	0	388,000
Accounts and other receivables	508,000	1,438,000
Prepaid expenses and other assets	78,000	(11,000)
Accounts payable and accrued expenses	(534,000)	(1,139,000)
Total adjustments	1,068,000	12,000
Net cash provided by operating activities	1,175,000	2,402,000
Purchase of property and equipment	(14,000)	(33,000)
Purchase of other investments	(477,000)	0
Proceeds on sale of equity securities at fair value, non-current	0	2,494,000
Proceeds from principal paydowns of available-for-sale debt securities at fair value	750,000	750,000
Return of capital on other investments	2,000	0
Net cash provided by investing activities	261,000	3,211,000
Principal payments on financing lease	(7,000)	0
Issuance of common stock	13,000	14,000
Repurchases of common stock	(133,000)	(82,000)
Dividends paid	(336,000)	(226,000)
Net cash used in financing activities	(463,000)	(294,000)
Net increase in cash, cash equivalents, and restricted cash	973,000	5,319,000
Beginning cash, cash equivalents, and restricted cash	23,314,000	15,436,000
Ending cash, cash equivalents, and restricted cash	24,287,000	20,755,000
Dividends declared but not paid	336,000	338,000
Unsettled sales of non-current investments	0	291,000
Cash paid for income taxes	0	1,926,000
Common Class A [Member]
Common Stock	347,000		347,000
Treasury stock, class A shares at cost; 1,014,031 shares and 978,049 shares at September 30, 2022, and June 30, 2022, respectively	2,722,000
Unsettled class A common stock repurchases	10,000	0
Common Class C [Member]
Common Stock	52,000		52,000
Common Class B [Member]
Common Stock	0		0
Common Stock [Member] | Common Class A [Member]
Total Shareholders’ Equity	347,000	347,000	347,000
Net Income	0	0
Other comprehensive loss, net of tax, as restated	$ 0	$ 0
Balance at June 30, 2022 (in shares)	13,866,999	13,866,913
Balance	$ 347,000	$ 347,000
Purchases of shares of Common Stock (class A) (in shares)	0	0
Purchases of shares of Common Stock (class A)	$ 0	$ 0
Issuance of stock under ESPP of shares of Common Stock (class A) (in shares)	0	0
Issuance of stock under ESPP of shares of Common Stock (class A)	$ 0	$ 0
Share-based compensation, adjustment for forfeitures, net of tax	0
Dividends declared	$ 0	$ 0
Balance at September 30, 2022 (As Restated) (in shares)	13,866,999	13,866,913
Balance	$ 347,000	$ 347,000
Common Stock [Member] | Common Class C [Member]
Total Shareholders’ Equity	52,000	52,000	52,000
Net Income	0	0
Other comprehensive loss, net of tax, as restated	$ 0	$ 0
Balance at June 30, 2022 (in shares)	2,068,549	2,068,635
Balance	$ 52,000	$ 52,000
Purchases of shares of Common Stock (class A) (in shares)	0	0
Purchases of shares of Common Stock (class A)	$ 0	$ 0
Issuance of stock under ESPP of shares of Common Stock (class A) (in shares)	0	0
Issuance of stock under ESPP of shares of Common Stock (class A)	$ 0	$ 0
Share-based compensation, adjustment for forfeitures, net of tax	0
Dividends declared	$ 0	$ 0
Balance at September 30, 2022 (As Restated) (in shares)	2,068,549	2,068,635
Balance	$ 52,000	$ 52,000
Additional Paid-in Capital [Member]
Total Shareholders’ Equity	16,440,000	16,073,000	16,438,000
Net Income	0	0
Other comprehensive loss, net of tax, as restated	0	0
Balance	16,438,000	15,677,000
Purchases of shares of Common Stock (class A)	0	0
Issuance of stock under ESPP of shares of Common Stock (class A)	3,000	8,000
Share-based compensation, adjustment for forfeitures, net of tax	(1,000)
Dividends declared	0	0
Balance	16,440,000	16,073,000
Treasury Stock, Common [Member]
Total Shareholders’ Equity	(2,722,000)	(2,248,000)	(2,599,000)
Net Income	0	0
Other comprehensive loss, net of tax, as restated	$ 0	$ 0
Balance at June 30, 2022 (in shares)	978,049	898,953
Balance	$ (2,599,000)	$ (2,172,000)
Purchases of shares of Common Stock (class A) (in shares)	39,965	13,647
Purchases of shares of Common Stock (class A)	$ (133,000)	$ (82,000)
Issuance of stock under ESPP of shares of Common Stock (class A) (in shares)	(3,983)	(2,228)
Issuance of stock under ESPP of shares of Common Stock (class A)	$ 10,000	$ 6,000
Share-based compensation, adjustment for forfeitures, net of tax	0
Dividends declared	$ 0	$ 0
Balance at September 30, 2022 (As Restated) (in shares)	1,014,031	910,372
Balance	$ (2,722,000)	$ (2,248,000)
Treasury Stock, Common [Member] | Common Class A [Member]
Purchases of shares of Common Stock (class A) (in shares)	39,965	13,647
Repurchases of common stock	$ (133,000)	$ (82,000)
AOCI Attributable to Parent [Member]
Total Shareholders’ Equity	3,138,000	5,952,000	3,624,000
Net Income	0	0
Other comprehensive loss, net of tax, as restated	(486,000)	(635,000)
Balance	3,624,000	6,587,000
Purchases of shares of Common Stock (class A)	0	0
Issuance of stock under ESPP of shares of Common Stock (class A)	0	0
Share-based compensation, adjustment for forfeitures, net of tax	0
Dividends declared	0	0
Balance	3,138,000	5,952,000
Retained Earnings [Member]
Total Shareholders’ Equity	36,074,000	35,885,000	36,302,000
Net Income	107,000	2,390,000
Other comprehensive loss, net of tax, as restated	0	0
Balance	36,302,000	33,833,000
Purchases of shares of Common Stock (class A)	0	0
Issuance of stock under ESPP of shares of Common Stock (class A)	0	0
Share-based compensation, adjustment for forfeitures, net of tax	0
Dividends declared	(335,000)	(338,000)
Balance	36,074,000	35,885,000
Investment Advisory Services [Member]
Revenues	4,377,000	6,470,000
Administrative Service [Member]
Revenues	35,000	$ 51,000
Revision of Prior Period, Adjustment [Member]
Deferred tax asset	622,000
Investments in equity securities at fair value, non-current	(2,140,000)
Total Shareholders’ Equity	(2,338,000)		(2,332,000)
Investment loss	(13,000)
Tax expense	(2,000)
Net Income	$ (11,000)
Earnings Per Share (in dollars per share)	$ 0
Investments in securities at fair value	$ (820,000)
Other comprehensive loss, net of tax, as restated	5,000
Cash and cash equivalents	0
Restricted cash	0
Investments in securities at fair value, current	0
Accounts and other receivables	0
Tax receivable	0
Prepaid expenses	0
Total Current Assets	0
Net Property and Equipment	0
Deferred tax asset	622,000
Investments in held-to-maturity debt securities	0
Other investments	0
Financing lease, right of use assets	0
Other assets, non-current	0
Total Other Assets	(2,338,000)
Total Assets	(2,338,000)
Accounts payable	0
Accrued compensation and related costs	0
Dividends payable	0
Financing lease liability, short-term	0
Other accrued expenses	0
Taxes payable	0
Total Current Liabilities	0
Financing lease liability, long-term	0
Total Long-Term Liabilities	0
Total Liabilities	0
Additional paid-in-capital	0
Accumulated comprehensive income, net of tax	(647,000)
Retained earnings	(1,691,000)
Total Liabilities and Shareholders’ Equity	(2,338,000)
Revenues	0
Employee compensation and benefits	0
General and administrative	0
Advertising	0
Depreciation	0
Interest	0
Operating Expenses	0
Operating Income	0
Income from equity method investments	0
Other income	0
Nonoperating Income (Expense)	(13,000)
Income Before Income Taxes	$ (13,000)
Diluted Net Income per Share (in dollars per share)	$ 0
Basic weighted average number of common shares outstanding (in shares)
Diluted weighted average number of common shares outstanding (in shares)
Unrealized losses on available-for-sale securities arising during period	$ 5,000
Less: reclassification adjustment for gains included in net income	0
Net change from available-for-sale securities, net of tax	5,000
Foreign currency translation adjustment	0
Comprehensive Income (Loss)	(6,000)
Balance	(2,332,000)
Balance	(2,338,000)
Depreciation, amortization and accretion	0
Net recognized loss on disposal of fixed assets	0
Net realized gains on securities	0
Unrealized losses on securities	13,000
Net income from equity method investment	0
Provision for deferred taxes	(2,000)
Stock-based compensation expense	0
Accounts and other receivables	0
Prepaid expenses and other assets	0
Accounts payable and accrued expenses	0
Total adjustments	11,000
Net cash provided by operating activities	0
Purchase of property and equipment	0
Purchase of other investments	0
Proceeds on sale of equity securities at fair value, non-current	0
Proceeds from principal paydowns of available-for-sale debt securities at fair value	0
Return of capital on other investments	0
Net cash provided by investing activities	0
Principal payments on financing lease	0
Issuance of common stock	0
Repurchases of common stock	0
Dividends paid	0
Net cash used in financing activities	0
Net increase in cash, cash equivalents, and restricted cash	0
Beginning cash, cash equivalents, and restricted cash	0
Ending cash, cash equivalents, and restricted cash	0
Dividends declared but not paid	0
Unsettled sales of non-current investments	0
Cash paid for income taxes	0
Revision of Prior Period, Adjustment [Member] | Common Class A [Member]
Common Stock	0
Treasury stock, class A shares at cost; 1,014,031 shares and 978,049 shares at September 30, 2022, and June 30, 2022, respectively	(0)
Unsettled class A common stock repurchases	0
Revision of Prior Period, Adjustment [Member] | Common Class C [Member]
Common Stock	0
Revision of Prior Period, Adjustment [Member] | Common Class B [Member]
Common Stock	0
Revision of Prior Period, Adjustment [Member] | Common Stock [Member] | Common Class A [Member]
Total Shareholders’ Equity			0
Net Income	0
Other comprehensive loss, net of tax, as restated	0
Balance	0
Revision of Prior Period, Adjustment [Member] | Common Stock [Member] | Common Class C [Member]
Total Shareholders’ Equity			0
Balance	0
Revision of Prior Period, Adjustment [Member] | Additional Paid-in Capital [Member]
Total Shareholders’ Equity			0
Net Income	0
Other comprehensive loss, net of tax, as restated	0
Balance	0
Revision of Prior Period, Adjustment [Member] | Treasury Stock, Common [Member]
Total Shareholders’ Equity			0
Net Income	0
Other comprehensive loss, net of tax, as restated	0
Balance	0
Revision of Prior Period, Adjustment [Member] | AOCI Attributable to Parent [Member]
Total Shareholders’ Equity			(652,000)
Net Income	0
Other comprehensive loss, net of tax, as restated	5,000
Balance	(652,000)
Revision of Prior Period, Adjustment [Member] | Retained Earnings [Member]
Total Shareholders’ Equity			(1,680,000)
Net Income	(11,000)
Other comprehensive loss, net of tax, as restated	0
Balance	(1,680,000)
Revision of Prior Period, Adjustment [Member] | Investment Advisory Services [Member]
Revenues	0
Revision of Prior Period, Adjustment [Member] | Administrative Service [Member]
Revenues	0
Previously Reported [Member]
Deferred tax asset	751,000
Investments in equity securities at fair value, non-current	4,383,000
Total Shareholders’ Equity	55,667,000		56,496,000
Investment loss	(1,447,000)
Tax expense	81,000
Net Income	$ 118,000
Earnings Per Share (in dollars per share)	$ 0.01
Investments in securities at fair value	$ 10,686,000
Other comprehensive loss, net of tax, as restated	(491,000)
Cash and cash equivalents	23,287,000
Restricted cash	1,000,000
Investments in securities at fair value, current	11,963,000
Accounts and other receivables	1,576,000
Tax receivable	96,000
Prepaid expenses	312,000
Total Current Assets	38,234,000
Net Property and Equipment	1,320,000
Deferred tax asset	751,000
Investments in held-to-maturity debt securities	1,000,000
Other investments	2,630,000
Financing lease, right of use assets	86,000
Other assets, non-current	233,000
Total Other Assets	19,769,000
Total Assets	59,323,000
Accounts payable	14,000
Accrued compensation and related costs	1,925,000
Dividends payable	336,000
Financing lease liability, short-term	28,000
Other accrued expenses	1,137,000
Taxes payable	157,000
Total Current Liabilities	3,597,000
Financing lease liability, long-term	59,000
Total Long-Term Liabilities	59,000
Total Liabilities	3,656,000
Additional paid-in-capital	16,440,000
Accumulated comprehensive income, net of tax	3,785,000
Retained earnings	37,765,000
Total Liabilities and Shareholders’ Equity	59,323,000
Revenues	4,412,000
Employee compensation and benefits	1,175,000
General and administrative	1,504,000
Advertising	86,000
Depreciation	61,000
Interest	1,000
Operating Expenses	2,827,000
Operating Income	1,585,000
Income from equity method investments	0
Other income	61,000
Nonoperating Income (Expense)	(1,386,000)
Income Before Income Taxes	$ 199,000
Diluted Net Income per Share (in dollars per share)	$ 0.01
Basic weighted average number of common shares outstanding (in shares)	14,948,688
Diluted weighted average number of common shares outstanding (in shares)	14,949,275
Unrealized losses on available-for-sale securities arising during period	$ (120,000)
Less: reclassification adjustment for gains included in net income	(371,000)
Net change from available-for-sale securities, net of tax	(491,000)
Foreign currency translation adjustment	0
Comprehensive Income (Loss)	(373,000)
Balance	56,496,000
Purchases of shares of Common Stock (class A)	(133,000)
Issuance of stock under ESPP of shares of Common Stock (class A)	13,000
Share-based compensation, adjustment for forfeitures, net of tax	(1,000)
Dividends declared	(335,000)
Balance	55,667,000
Depreciation, amortization and accretion	(77,000)
Net recognized loss on disposal of fixed assets	3,000
Net realized gains on securities	(469,000)
Unrealized losses on securities	1,917,000
Net income from equity method investment	0
Provision for deferred taxes	(369,000)
Stock-based compensation expense	0
Accounts and other receivables	508,000
Prepaid expenses and other assets	78,000
Accounts payable and accrued expenses	(534,000)
Total adjustments	1,057,000
Net cash provided by operating activities	1,175,000
Purchase of property and equipment	(14,000)
Purchase of other investments	(477,000)
Proceeds on sale of equity securities at fair value, non-current	0
Proceeds from principal paydowns of available-for-sale debt securities at fair value	750,000
Return of capital on other investments	2,000
Net cash provided by investing activities	261,000
Principal payments on financing lease	(7,000)
Issuance of common stock	13,000
Repurchases of common stock	(133,000)
Dividends paid	(336,000)
Net cash used in financing activities	(463,000)
Net increase in cash, cash equivalents, and restricted cash	973,000
Beginning cash, cash equivalents, and restricted cash	23,314,000
Ending cash, cash equivalents, and restricted cash	24,287,000
Dividends declared but not paid	336,000
Unsettled sales of non-current investments	0
Cash paid for income taxes	0
Previously Reported [Member] | Common Class A [Member]
Common Stock	347,000
Treasury stock, class A shares at cost; 1,014,031 shares and 978,049 shares at September 30, 2022, and June 30, 2022, respectively	2,722,000
Unsettled class A common stock repurchases	10,000
Previously Reported [Member] | Common Class C [Member]
Common Stock	52,000
Previously Reported [Member] | Common Class B [Member]
Common Stock	0
Previously Reported [Member] | Common Stock [Member] | Common Class A [Member]
Total Shareholders’ Equity	347,000		347,000
Net Income	0
Other comprehensive loss, net of tax, as restated	$ 0
Balance at June 30, 2022 (in shares)	13,866,999
Balance	$ 347,000
Purchases of shares of Common Stock (class A) (in shares)	0
Purchases of shares of Common Stock (class A)	$ 0
Issuance of stock under ESPP of shares of Common Stock (class A) (in shares)	0
Issuance of stock under ESPP of shares of Common Stock (class A)	$ 0
Share-based compensation, adjustment for forfeitures, net of tax	0
Dividends declared	$ 0
Balance at September 30, 2022 (As Restated) (in shares)	13,866,999
Balance	$ 347,000
Previously Reported [Member] | Common Stock [Member] | Common Class C [Member]
Total Shareholders’ Equity			52,000
Balance at June 30, 2022 (in shares)	2,068,549
Balance	$ 52,000
Purchases of shares of Common Stock (class A) (in shares)	0
Issuance of stock under ESPP of shares of Common Stock (class A) (in shares)	0
Balance at September 30, 2022 (As Restated) (in shares)	2,068,549
Previously Reported [Member] | Additional Paid-in Capital [Member]
Total Shareholders’ Equity	$ 16,440,000		16,438,000
Net Income	0
Other comprehensive loss, net of tax, as restated	0
Balance	16,438,000
Purchases of shares of Common Stock (class A)	0
Issuance of stock under ESPP of shares of Common Stock (class A)	3,000
Share-based compensation, adjustment for forfeitures, net of tax	(1,000)
Dividends declared	0
Balance	16,440,000
Previously Reported [Member] | Treasury Stock, Common [Member]
Total Shareholders’ Equity	(2,722,000)		(2,599,000)
Net Income	0
Other comprehensive loss, net of tax, as restated	$ 0
Balance at June 30, 2022 (in shares)	978,049
Balance	$ (2,599,000)
Purchases of shares of Common Stock (class A) (in shares)	39,965
Purchases of shares of Common Stock (class A)	$ (133,000)
Issuance of stock under ESPP of shares of Common Stock (class A) (in shares)	(3,983)
Issuance of stock under ESPP of shares of Common Stock (class A)	$ 10,000
Share-based compensation, adjustment for forfeitures, net of tax	0
Dividends declared	$ 0
Balance at September 30, 2022 (As Restated) (in shares)	1,014,031
Balance	$ (2,722,000)
Previously Reported [Member] | AOCI Attributable to Parent [Member]
Total Shareholders’ Equity	3,785,000		4,276,000
Net Income	0
Other comprehensive loss, net of tax, as restated	(491,000)
Balance	4,276,000
Purchases of shares of Common Stock (class A)	0
Issuance of stock under ESPP of shares of Common Stock (class A)	0
Share-based compensation, adjustment for forfeitures, net of tax	0
Dividends declared	0
Balance	3,785,000
Previously Reported [Member] | Retained Earnings [Member]
Total Shareholders’ Equity	37,765,000		$ 37,982,000
Net Income	118,000
Other comprehensive loss, net of tax, as restated	0
Balance	37,982,000
Purchases of shares of Common Stock (class A)	0
Issuance of stock under ESPP of shares of Common Stock (class A)	0
Share-based compensation, adjustment for forfeitures, net of tax	0
Dividends declared	(335,000)
Balance	37,765,000
Previously Reported [Member] | Investment Advisory Services [Member]
Revenues	4,377,000
Previously Reported [Member] | Administrative Service [Member]
Revenues	35,000
Common Shares Purchase Warrants [Member] | Revision of Prior Period, Adjustment [Member]
Deferred tax asset	449,000
Investments in equity securities at fair value, non-current	(2,140,000)
Total Shareholders’ Equity	(1,691,000)
Investment loss	(13,000)
Tax expense	(2,000)
Net Income	$ (11,000)
Earnings Per Share (in dollars per share)	$ 0
Deferred tax asset	$ 449,000
Balance
Balance	(1,691,000)
Unsecured Convertible Debentures [Member] | Revision of Prior Period, Adjustment [Member]
Deferred tax asset	173,000
Total Shareholders’ Equity	(647,000)
Investments in securities at fair value	(820,000)
Other comprehensive loss, net of tax, as restated	5,000
Deferred tax asset	173,000
Balance
Balance	$ (647,000)