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Note 3 - Investments (Details Textual) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 30, 2016 | Dec. 31, 2022 | Jun. 30, 2021 | Mar. 31, 2020 | Jun. 30, 2018 | Dec. 31, 2022 | Dec. 31, 2021
Equity Method Investment, Other than Temporary Impairment |  |  |  |  |  | $ 1,450,000 | $ 0
Equity Method Investments |  | $ 4,180,000 |  | $ 0 |  | $ 4,180,000 | 3,615,000
Ownership Percentage |  | 28.00% |  |  |  | 28.00% |
Gain (Loss) on Investments, Total |  |  |  |  |  | $ 275,000 | (172,000)
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount |  |  |  | $ 750,000 | $ 250,000 |  |
Long-Term Investments, Total |  | $ 5,180,000 |  |  |  | 5,180,000 | 6,355,000
Long-term Investments [Member] |  |  |  |  |  |  |
Equity Method Investments |  | 1,822,000 |  |  |  | 1,822,000 |
Other Current Liabilities [Member] |  |  |  |  |  |  |
Deposit Liability, Current |  | 651,000 |  |  |  | 651,000 | $ 706,000
Investee [Member] |  |  |  |  |  |  |
Equity Method Investments |  | 0 |  |  |  | $ 0 |
Investment Income [Member] |  |  |  |  |  |  |
Equity Method Investment, Other than Temporary Impairment |  | $ 1,450,000 |  |  |  |  |
Privately-Held Identity and Professional Services Company With Ties to the FinTech Industry [Member] |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  | 40.00% |  |  |  | 40.00% |
Investments, Unfunded Commitments | $ 1,000,000 |  |  |  |  |  |
Transfer Advisory Business to New Entity [Member] |  |  |  |  |  |  |
Financing Receivable, after Allowance for Credit Loss, Total |  | $ 2,806,000 |  |  |  | $ 2,806,000 |
Cash |  | 800,000 |  |  |  | 800,000 |
Privately Held Company Providing Supply Chain and Receivables Financing [Member] |  |  |  |  |  |  |
Payments to Acquire Investments, Total |  |  | $ 1,000,000 |  |  |  |
Long-Term Investments, Total |  | $ 1,000,000 |  |  |  | $ 1,000,000 |

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