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Note 8 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2020
IRA Excise Taxes Payable on Share Repurchases $ 74  
Two Thousand Nineteen Through Two Thousand Twenty Six [Member] | Texas Franchise Tax [Member]    
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority   $ 89