Note 8 - Fair Value Measurement (Tables)

12 Months Ended

Dec. 31, 2022

Notes Tables

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

	Fair Value Measurement at Reporting Date Using
December 31, 2022	Level 1		Level 2		Level 3		Total
Cash equivalents
Money market funds	$	99,806	$	—	$	—	$	99,806
Other current assets
Commodity swap		—		121		—		121
Total assets	$	99,806	$	121	$	—	$	99,927

December 31, 2021 (1)
Cash equivalents
Money market funds	$	65,233	$	—	$	—	$	65,233
Total assets	$	65,233	$	—	$	—	$	65,233
Accrued and other current liabilities
Interest rate swap	$	—	$	3,514	$	—	$	3,514
Total liabilities	$	—	$	3,514	$	—	$	3,514

Fair Value, by Balance Sheet Grouping [Table Text Block]

December 31,		2022				2021
	Fair Value Hierarchy	Carrying Value		Fair Value		Carrying Value		Fair Value
Assets:
Held-to-maturity marketable securities (1)	Level 1	$	65,943	$	64,584	$	15,600	$	15,459
Liabilities (including current maturities):
2.75% Convertible Notes (2),(3)	Level 2	$	230,000	$	281,365	$	207,354	$	313,785
Third Amended and Restated Credit Agreement - term loan (2)	Level 3	$	—	$	—	$	123,750	$	124,598
Fourth Amended and Restated Credit Agreement - revolver (2)	Level 3	$	50,000	$	49,536	$	—	$	—