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Note 4 - Real Property and Other Income, Expense (Details Textual) - Office Building [Member] - TEXAS | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Aug. 04, 2021 ft²
--- | --- | --- | ---
Net Rentable Area (Square Foot) | ft² |  |  | 90,000
Percentage of Occupancy | 25.00% |  |
Accrual for Taxes Other than Income Taxes, Current | $ | $ 338,000 | $ 433,000 |

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- Definition Carrying value as of the balance sheet date of obligations incurred and payable for real and property taxes. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 8 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483467/210-10-45-8 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 720 -SubTopic 30 -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483384/720-30-45-1 + Details
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