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Note 4 - Investments (Details Textual) - USD ($) |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 30, 2016 | Dec. 31, 2023 | Sep. 30, 2023 | Dec. 31, 2022 | Jun. 30, 2021 | Mar. 31, 2020 | Jun. 30, 2018 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Jun. 30, 2019
Equity Method Investments |  |  |  |  |  | $ 0 |  |  |  |  |
Payments to Acquire Equity Method Investments |  |  |  |  |  |  |  | $ 655,000 |  |  |
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount |  |  |  |  |  | $ 750,000 | $ 250,000 |  |  |  |
Other Current Liabilities [Member] |  |  |  |  |  |  |  |  |  |  |
Deposit Liability, Current |  | $ 1,005,000 |  | $ 651,000 |  |  |  | $ 1,005,000 | $ 651,000 |  |
Privately-Held Identity and Professional Services Company With Ties to the FinTech Industry [Member] |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  |  |  |  |  |  | 40.00%
Asset Impairment Charges |  |  |  | 1,450,000 |  |  |  |  |  |  |
Equity Method Investments |  |  |  | 0 |  |  |  |  | 0 |  |
Investments, Unfunded Commitments | $ 1,000,000 |  |  |  |  |  |  |  |  |  |
Transfer Advisory Business to New Entity [Member] |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  | 26.50% |  |  |  |  |  | 26.50% |  | 28.00% |
Equity Method Investments |  | $ 3,907,000 |  | $ 4,180,000 |  |  |  | $ 3,907,000 | 4,180,000 |  |
Financing Receivable, after Allowance for Credit Loss |  |  |  |  |  |  |  |  |  | $ 2,806,000 |
Cash |  |  |  |  |  |  |  |  |  | $ 800,000 |
Sale of Stock, Consideration Received on Transaction |  | 2,700,000 |  |  |  |  |  |  |  |  |
Payments to Acquire Equity Method Investments |  | 500,000 |  |  |  |  |  |  |  |  |
Gain (Loss) on Investments, Total |  |  |  |  |  |  |  | (773,000) | $ 275,000 |  |
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity |  | 2,800,000 |  |  |  |  |  | 2,800,000 |  |  |
Privately Held Company Providing Supply Chain and Receivables Financing [Member] |  |  |  |  |  |  |  |  |  |  |
Asset Impairment Charges |  |  | $ 1,000,000 |  |  |  |  |  |  |  |
Equity Method Investments |  | $ 0 |  |  |  |  |  | $ 0 |  |  |
Payments to Acquire Investments, Total |  |  |  |  | $ 1,000,000 |  |  |  |  |  |

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