Note 3 - U.S. Treasury Securities, Available-for-sale (Tables)

3 Months Ended

Mar. 31, 2026

Notes Tables

Schedule of Available-for-Sale Securities Reconciliation [Table Text Block]

(in thousands)
			Gross		Gross
	Amortized		Unrealized		Unrealized			Fair
	Cost		Gains		Losses			Value
March 31, 2026
U.S. Treasury Note, 4.625%, 6/30/2026 Maturity	$	100,068	$	162	$	-		$	100,230
U.S. Treasury Note, 0.75%, 5/31/2026 Maturity		34,832		-		(4	)		34,828
U.S. Treasury Note, 4.125%, 10/31/2026 Maturity		20,056		-		(19	)		20,037
	$	154,956	$	162	$	(23	)	$	155,095
December 31, 2025
U.S. Treasury Note, 4.625%, 6/30/2026 Maturity	$	100,136	$	395	$	-		$	100,531
U.S. Treasury Note, 0.75%, 5/31/2026 Maturity		34,579	$	23				$	34,602
	$	134,715	$	418	$	-		$	135,133