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Note 8 - Bonds Payable, Loans Payable and Interest (Details Textual) - Series 2021 Bonds [Member] - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024	May 20, 2021
Long-Term Debt, Gross	$ 166,340	$ 166,340	$ 166,300
Debt Instrument, Unamortized Premium, Total	249	249	200
Fair Value, Inputs, Level 2 [Member]
Long-Term Debt, Fair Value	$ 141,800	$ 143,800
Tranche One [Member]
Long-Term Debt, Gross			$ 21,100
Debt Instrument, Interest Rate, Stated Percentage			4.00%
Tranche Two [Member]
Long-Term Debt, Gross			$ 30,400
Debt Instrument, Interest Rate, Stated Percentage			4.00%
Tranche Three [Member]
Long-Term Debt, Gross			$ 114,800
Debt Instrument, Interest Rate, Stated Percentage			4.25%

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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