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

3 Months Ended

Mar. 31, 2025

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, 2025
U.S. Treasury Note, 4.625%, 6/30/2026 Maturity	$	100,343	$	389	$	-	$	100,732
U.S. Treasury Bill maturing 6/5/2025		24,811		-		-		24,811
	$	125,154	$	389	$	-	$	125,543
December 31, 2024
U.S. Treasury Note, 4.625%, 6/30/2026 Maturity	$	100,412	$	139	$	-	$	100,551
	$	100,412	$	139	$	-	$	100,551