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

6 Months Ended

Jun. 30, 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
June 30, 2024
U.S. Treasury Bill maturing 10/24/2024	$	49,176	$	-	$	(4	)	$	49,172
U.S. Treasury Bill maturing 11/29/2024		48,916		11		-			48,927
	$	98,092	$	11	$	(4	)	$	98,099
December 31, 2023
U.S. Treasury Bill maturing 1/2/2024	$	49,671	$	9	$	-		$	49,680
U.S. Treasury Bill maturing 2/15/2024		49,992		8		-			50,000
U.S. Treasury Bill maturing 4/30/2024		49,140		-		-			49,140
	$	148,803	$	17	$	-		$	148,820