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

9 Months Ended

Sep. 30, 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
September 30, 2025
U.S. Treasury Note, 4.625%, 6/30/2026 Maturity	$	100,205	$	408	$	-	$	100,613
U.S. Treasury Bill maturing 12/4/2025		24,816		11		-		24,827
	$	125,021	$	419	$	-	$	125,440
December 31, 2024
U.S. Treasury Note, 4.625%, 6/30/2026 Maturity	$	100,412	$	139	$	-	$	100,551
	$	100,412	$	139	$	-	$	100,551