Note 7 - Marketable Securities - Marketable Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Amortized Cost	$ 4,976	$ 4,950
Estimated Fair Value	5,054	$ 4,973
Corporate and Municipal Debt Securities [Member]
Amortized Cost	4,976
Unrealized Gain	79
Unrealized Loss	(1)
Estimated Fair Value	$ 5,054

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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