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Note 1 - Significant Accounting Policies and Recent Accounting Pronouncements (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Tangible Asset Impairment Charges     $ 0 $ 0
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 310,794 310,794 310,794 310,794
Payments of Ordinary Dividends, Common Stock     $ 0 $ 0