Note 4 - Marketable Securities (Tables)

6 Months Ended

Jun. 30, 2026

Notes Tables

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

		June 30, 2026 (Unaudited)
		Amortized cost				Gross unrealized gains				Gross unrealized losses				Fair value
Available-for-sale - matures within one year:
Corporate bonds		$	76,711			$	38			$	(174	)		$	76,575

Available-for-sale - matures after one year through four years:
Corporate bonds			95,466				39				(809	)			94,696
Total
		$	172,177			$	77			$	(983	)		$	171,271

		December 31, 2025
		Amortized cost				Gross unrealized gains				Gross unrealized losses				Fair value
Available-for-sale - matures within one year:
Corporate bonds		$	106,154			$	157			$	(407	)		$	105,904

Available-for-sale - matures after one year through three years:
Corporate bonds			73,103				366				(71	)			73,398

Total		$	179,257			$	523			$	(478	)		$	179,302

Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block]

		Less than 12 months								12 months or greater
		Fair value				Gross unrealized loss				Fair value				Gross unrealized loss
As of June 30, 2026 (unaudited)		$	107,428			$	(874	)		$	19,037			$	(109	)
As of December 31, 2025		$	65,252			$	(115	)		$	32,678			$	(363	)

Schedule of Realized Gain (Loss) [Table Text Block]

		Six months ended June 30,								Three months ended June 30,
		2026				2025				2026				2025
		(unaudited)				(unaudited)				(unaudited)				(unaudited)

Gross realized gains from sale of available-for-sale marketable securities		$	—			$	16			$	—			$	16
Gross realized losses from sale of available-for-sale marketable securities		$	—			$	—			$	—			$	—