Note 10 - Fair Value Measurement (Tables)

9 Months Ended

Sep. 30, 2022

Notes Tables

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

	Fair Value Measurement at Reporting Date Using
September 30, 2022	Level 1		Level 2			Level 3		Total
Cash equivalents
Money market funds	$	76,752	$	—		$	—	$	76,752
Other current assets
Commodity swap		—		(43	)		—		(43	)
Total assets	$	76,752	$	(43	)	$	—	$	76,709

December 31, 2021
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

September 30, 2021
Cash equivalents
Money market funds	$	61,231	$	—	$	—	$	61,231
Other current assets
Restricted cash		1,512		—		—		1,512
Total assets	$	62,743	$	—	$	—	$	62,743
Accrued and other current liabilities
Interest rate swap	$	—	$	5,001	$	—	$	5,001
Total liabilities	$	—	$	5,001	$	—	$	5,001

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

		September 30, 2022				December 31, 2021				September 30, 2021
(in thousands)	Fair Value Hierarchy	Carrying Value		Fair Value		Carrying Value		Fair Value		Carrying Value		Fair Value
Assets:
Held-to-maturity marketable securities (1)	Level 1	$	61,448	$	59,947	$	15,600	$	15,459	$	10,600	$	10,582
Liabilities (including current maturities):
2.75% Convertible Notes (2),(3)	Level 2	$	230,000	$	236,440	$	207,354	$	313,785	$	205,543	$	326,025
Third Amended and Restated Credit Agreement - term loan (2)	Level 3	$	—	$	—	$	123,750	$	124,598	$	125,625	$	126,610
Fourth Amended and Restated Credit Agreement - revolver (2)	Level 3	$	50,000	$	50,165	$	—	$	—	$	—	$	—