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Note 3 - Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Jun. 30, 2022 | Jun. 30, 2021
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | $ 12,800 | $ 7,300
Equity Method Investment, Other than Temporary Impairment | 0 | 0
Accounts Receivable, Allowance for Credit Loss, Ending Balance | 0 | 0
Impairment, Long-Lived Asset, Held-for-Use, Total | 0 | $ 0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total | $ 0 |
Investment Advisory Fees, Fee Adjustment Base Percentage Adjustment | 0.25% |
Investment Advisory Fees, Fee Adjustment Percent, Minimum Performance to Designed Benchmark Over Prior Rolling 12 Months | 5.00% |
Domestic Tax Authority [Member] |  |
Open Tax Year | 2018 2019 2020 2021 |
Foreign Tax Authority [Member] |  |
Open Tax Year | 2015 2016 2017 2018 2019 2020 2021 |
Furniture and Fixtures [Member] | Minimum [Member] |  |
Property, Plant and Equipment, Useful Life (Year) | 3 years |
Furniture and Fixtures [Member] | Maximum [Member] |  |
Property, Plant and Equipment, Useful Life (Year) | 10 years |
Building and Building Improvements [Member] | Minimum [Member] |  |
Property, Plant and Equipment, Useful Life (Year) | 14 years |
Building and Building Improvements [Member] | Maximum [Member] |  |
Property, Plant and Equipment, Useful Life (Year) | 40 years |

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- Definition Amount of allowance for credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(5)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479344/326-20-45-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-4 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 + Details
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