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Note 2 - Basis of Presentation and Consolidation (Details Textual) - USD ($) | Mar. 31, 2024 | Jul. 01, 2023 | Jun. 30, 2023
--- | --- | --- | ---
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | $ 10,900,000 |  | $ 12,500,000
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Noncurrent | 157,000 |  | (0)
Retained Earnings (Accumulated Deficit) | 37,628,000 |  | 37,747,000
Accounts Receivable, Allowance for Credit Loss | $ 0 | $ 0 | $ 0
Accounting Standards Update 2016-13 [Member] |  |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Noncurrent |  | 232,000 |
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |
Retained Earnings (Accumulated Deficit) |  | $ (183,000) |

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