Note J - Fair Value of Financial Instruments - Financial Instruments Measured at Fair Value on a Recurring Basis (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Cash and cash equivalents	$ 67,428	$ 45,366
Restricted cash	11,705	9,731
Total assets	79,133	55,316
Bank acceptance payable	19,259	15,482
Convertible senior notes	148,625	76,519
Total liabilities	167,884	92,001
Note receivable		219
Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	67,428	45,366
Restricted cash	11,705	9,731
Total assets	79,133	55,097
Bank acceptance payable	0	0
Convertible senior notes	0	0
Total liabilities	0	0
Note receivable		0
Fair Value, Inputs, Level 2 [Member]
Cash and cash equivalents	0	0
Restricted cash	0	0
Total assets	0	219
Bank acceptance payable	19,259	15,482
Convertible senior notes	148,625	76,519
Total liabilities	167,884	92,001
Note receivable		219
Fair Value, Inputs, Level 3 [Member]
Cash and cash equivalents	0	0
Restricted cash	0	0
Total assets	0	0
Bank acceptance payable	0	0
Convertible senior notes	0	0
Total liabilities	$ 0	0
Note receivable		$ 0