Note 5 - Fair Value Measurement - Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Corporate bonds	$ 132,695	$ 112,080
Foreign exchange contract	988	13
Investments in marketable equity securities	406	408
Foreign exchange contracts		119
Fair Value, Inputs, Level 1 [Member]
Foreign exchange contract	0	0
Investments in marketable equity securities	406	408
Foreign exchange contracts		0
Fair Value, Inputs, Level 2 [Member]
Foreign exchange contract	988	13
Investments in marketable equity securities	0
Foreign exchange contracts		119
Fair Value, Inputs, Level 3 [Member]
Foreign exchange contract	0	0
Investments in marketable equity securities	0	0
Foreign exchange contracts		0
Corporate Bonds [Member]
Corporate bonds	132,695	112,080
Corporate Bonds [Member] | Fair Value, Inputs, Level 1 [Member]
Corporate bonds	0	0
Corporate Bonds [Member] | Fair Value, Inputs, Level 2 [Member]
Corporate bonds	132,695	112,080
Corporate Bonds [Member] | Fair Value, Inputs, Level 3 [Member]
Corporate bonds	$ 0	$ 0