Note 13 - Selected Statements of Income Data (Tables)

12 Months Ended

Dec. 31, 2021

Notes Tables

Interest and Other Income [Table Text Block]

	Year ended December 31,
	2019			2020			2021
Interest income	$	4,220		$	3,291		$	1,873
Gain (loss) on available-for-sale marketable securities, net		(28	)		(6	)		13
Amortization of premium on available-for-sale marketable securities, net		(554	)		(444	)		(420	)
Foreign exchange gain (loss), net		(347	)		443			(1,269	)
Total	$	3,291		$	3,284		$	197

Equity Securities without Readily Determinable Fair Value [Table Text Block]

Initial cost basis	$	1,806
Upward adjustments		1,113
Total carrying value at the end of the period	$	2,919