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

12 Months Ended

Dec. 31, 2024

Notes Tables

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

(in thousands)
			Gross		Gross
	Amortized		Unrealized		Unrealized		Fair
	Cost		Gains		Losses		Value
December 31, 2024
U.S. Treasury Note, 4.625%, 6/30/2026 Maturity	$	100,412	$	139	$	-	$	100,551
	$	100,412	$	139	$	-	$	100,551
December 31, 2023
U.S. Treasury Bill, 1/2/2024 Maturity	$	49,671	$	9	$	-	$	49,680
U.S. Treasury Bill, 2/15/2024 Maturity		49,992		8		-		50,000
U.S. Treasury Bill, 4/30/2024 Maturity		49,140		-		-		49,140
	$	148,803	$	17	$	-	$	148,820