Note 4 - Investments in Debt Securities (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

Debt Securities, Available-for-Sale [Table Text Block]

		Amortized Cost				Fair Value
	Longest	December 31,				December 31,
	Maturity Date	2023		2022		2023		2022
U.S. government and agency securities	2025	$	9,733	$	11,964	$	9,838	$	11,922
Corporate bonds	2029		4,605		10,421		4,552		10,159
		$	14,338	$	22,385	$	14,390	$	22,081